diff --git a/devscripts/bash-completion.py b/devscripts/bash-completion.py
index 49287724d..70a3f552c 100755
--- a/devscripts/bash-completion.py
+++ b/devscripts/bash-completion.py
@@ -9,16 +9,17 @@ import youtube_dl
 BASH_COMPLETION_FILE = "youtube-dl.bash-completion"
 BASH_COMPLETION_TEMPLATE = "devscripts/bash-completion.in"
 
+
 def build_completion(opt_parser):
     opts_flag = []
     for group in opt_parser.option_groups:
         for option in group.option_list:
-            #for every long flag
+            # for every long flag
             opts_flag.append(option.get_opt_string())
     with open(BASH_COMPLETION_TEMPLATE) as f:
         template = f.read()
     with open(BASH_COMPLETION_FILE, "w") as f:
-        #just using the special char
+        # just using the special char
         filled_template = template.replace("{{flags}}", " ".join(opts_flag))
         f.write(filled_template)
 
diff --git a/devscripts/buildserver.py b/devscripts/buildserver.py
index e0c3cc83e..42ee2b5cb 100644
--- a/devscripts/buildserver.py
+++ b/devscripts/buildserver.py
@@ -233,6 +233,7 @@ def rmtree(path):
 
 #==============================================================================
 
+
 class BuildError(Exception):
     def __init__(self, output, code=500):
         self.output = output
@@ -369,7 +370,7 @@ class Builder(PythonBuilder, GITBuilder, YoutubeDLBuilder, DownloadBuilder, Clea
 
 
 class BuildHTTPRequestHandler(BaseHTTPRequestHandler):
-    actionDict = { 'build': Builder, 'download': Builder } # They're the same, no more caching.
+    actionDict = {'build': Builder, 'download': Builder}  # They're the same, no more caching.
 
     def do_GET(self):
         path = urlparse.urlparse(self.path)
diff --git a/devscripts/fish-completion.py b/devscripts/fish-completion.py
index f4aaf0201..2185d5522 100755
--- a/devscripts/fish-completion.py
+++ b/devscripts/fish-completion.py
@@ -23,6 +23,7 @@ EXTRA_ARGS = {
     'batch-file': ['--require-parameter'],
 }
 
+
 def build_completion(opt_parser):
     commands = []
 
diff --git a/devscripts/gh-pages/sign-versions.py b/devscripts/gh-pages/sign-versions.py
index 8a824df56..953a5162e 100755
--- a/devscripts/gh-pages/sign-versions.py
+++ b/devscripts/gh-pages/sign-versions.py
@@ -11,22 +11,22 @@ except NameError:
 
 versions_info = json.load(open('update/versions.json'))
 if 'signature' in versions_info:
-	del versions_info['signature']
+    del versions_info['signature']
 
 print('Enter the PKCS1 private key, followed by a blank line:')
 privkey = b''
 while True:
-	try:
-		line = input()
-	except EOFError:
-		break
-	if line == '':
-		break
-	privkey += line.encode('ascii') + b'\n'
+    try:
+        line = input()
+    except EOFError:
+        break
+    if line == '':
+        break
+    privkey += line.encode('ascii') + b'\n'
 privkey = rsa.PrivateKey.load_pkcs1(privkey)
 
 signature = hexlify(rsa.pkcs1.sign(json.dumps(versions_info, sort_keys=True).encode('utf-8'), privkey, 'SHA-256')).decode()
 print('signature: ' + signature)
 
 versions_info['signature'] = signature
-json.dump(versions_info, open('update/versions.json', 'w'), indent=4, sort_keys=True)
\ No newline at end of file
+json.dump(versions_info, open('update/versions.json', 'w'), indent=4, sort_keys=True)
diff --git a/devscripts/gh-pages/update-copyright.py b/devscripts/gh-pages/update-copyright.py
index 12c2a9194..5bc5c6514 100755
--- a/devscripts/gh-pages/update-copyright.py
+++ b/devscripts/gh-pages/update-copyright.py
@@ -5,7 +5,7 @@ from __future__ import with_statement
 
 import datetime
 import glob
-import io # For Python 2 compatibilty
+import io  # For Python 2 compatibilty
 import os
 import re
 
diff --git a/devscripts/gh-pages/update-feed.py b/devscripts/gh-pages/update-feed.py
index 0ba15ae0f..46373a8db 100755
--- a/devscripts/gh-pages/update-feed.py
+++ b/devscripts/gh-pages/update-feed.py
@@ -73,4 +73,3 @@ atom_template = atom_template.replace('@ENTRIES@', entries_str)
 
 with io.open('update/releases.atom', 'w', encoding='utf-8') as atom_file:
     atom_file.write(atom_template)
-
diff --git a/devscripts/gh-pages/update-sites.py b/devscripts/gh-pages/update-sites.py
index 153e15c8a..0d526784d 100755
--- a/devscripts/gh-pages/update-sites.py
+++ b/devscripts/gh-pages/update-sites.py
@@ -9,6 +9,7 @@ sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(
 
 import youtube_dl
 
+
 def main():
     with open('supportedsites.html.in', 'r', encoding='utf-8') as tmplf:
         template = tmplf.read()
diff --git a/devscripts/transition_helper.py b/devscripts/transition_helper.py
index d5ca2d4ba..cfd21919b 100644
--- a/devscripts/transition_helper.py
+++ b/devscripts/transition_helper.py
@@ -4,7 +4,7 @@ import sys, os
 
 try:
     import urllib.request as compat_urllib_request
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import urllib2 as compat_urllib_request
 
 sys.stderr.write(u'Hi! We changed distribution method and now youtube-dl needs to update itself one more time.\n')
@@ -12,9 +12,9 @@ sys.stderr.write(u'This will only happen once. Simply press enter to go on. Sorr
 sys.stderr.write(u'The new location of the binaries is https://github.com/rg3/youtube-dl/downloads, not the git repository.\n\n')
 
 try:
-	raw_input()
-except NameError: # Python 3
-	input()
+    raw_input()
+except NameError:  # Python 3
+    input()
 
 filename = sys.argv[0]
 
diff --git a/devscripts/transition_helper_exe/setup.py b/devscripts/transition_helper_exe/setup.py
index aaf5c2983..bb3264af0 100644
--- a/devscripts/transition_helper_exe/setup.py
+++ b/devscripts/transition_helper_exe/setup.py
@@ -9,4 +9,4 @@ py2exe_options = {
     "dll_excludes": ['w9xpopen.exe']
 }
 
-setup(console=['youtube-dl.py'], options={ "py2exe": py2exe_options }, zipfile=None)
\ No newline at end of file
+setup(console=['youtube-dl.py'], options={"py2exe": py2exe_options}, zipfile=None)
diff --git a/devscripts/transition_helper_exe/youtube-dl.py b/devscripts/transition_helper_exe/youtube-dl.py
index 6297dfd40..edb449fb3 100644
--- a/devscripts/transition_helper_exe/youtube-dl.py
+++ b/devscripts/transition_helper_exe/youtube-dl.py
@@ -4,13 +4,17 @@ import sys, os
 import urllib2
 import json, hashlib
 
+
 def rsa_verify(message, signature, key):
     from struct import pack
     from hashlib import sha256
     from sys import version_info
+
     def b(x):
-        if version_info[0] == 2: return x
-        else: return x.encode('latin1')
+        if version_info[0] == 2:
+            return x
+        else:
+            return x.encode('latin1')
     assert(type(message) == type(b('')))
     block_size = 0
     n = key[0]
@@ -23,13 +27,17 @@ def rsa_verify(message, signature, key):
         raw_bytes.insert(0, pack("B", signature & 0xFF))
         signature >>= 8
     signature = (block_size - len(raw_bytes)) * b('\x00') + b('').join(raw_bytes)
-    if signature[0:2] != b('\x00\x01'): return False
+    if signature[0:2] != b('\x00\x01'):
+        return False
     signature = signature[2:]
-    if not b('\x00') in signature: return False
+    if not b('\x00') in signature:
+        return False
     signature = signature[signature.index(b('\x00'))+1:]
-    if not signature.startswith(b('\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20')): return False
+    if not signature.startswith(b('\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20')):
+        return False
     signature = signature[19:]
-    if signature != sha256(message).digest(): return False
+    if signature != sha256(message).digest():
+        return False
     return True
 
 sys.stderr.write(u'Hi! We changed distribution method and now youtube-dl needs to update itself one more time.\n')
@@ -92,7 +100,7 @@ echo Updating youtube-dl...
 ping 127.0.0.1 -n 5 -w 1000 > NUL
 move /Y "%s.new" "%s"
 del "%s"
-    \n""" %(exe, exe, bat))
+    \n""" % (exe, exe, bat))
     b.close()
 
     os.startfile(bat)
diff --git a/test/helper.py b/test/helper.py
index 8be37a183..91822935f 100644
--- a/test/helper.py
+++ b/test/helper.py
@@ -59,7 +59,7 @@ class FakeYDL(YoutubeDL):
         params = get_params(override=override)
         super(FakeYDL, self).__init__(params, auto_init=False)
         self.result = []
-        
+
     def to_screen(self, s, skip_eol=None):
         print(s)
 
@@ -72,8 +72,10 @@ class FakeYDL(YoutubeDL):
     def expect_warning(self, regex):
         # Silence an expected warning matching a regex
         old_report_warning = self.report_warning
+
         def report_warning(self, message):
-            if re.match(regex, message): return
+            if re.match(regex, message):
+                return
             old_report_warning(message)
         self.report_warning = types.MethodType(report_warning, self)
 
diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index ab61e1976..f8e4f930e 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -266,6 +266,7 @@ class TestFormatSelection(unittest.TestCase):
             'ext': 'mp4',
             'width': None,
         }
+
         def fname(templ):
             ydl = YoutubeDL({'outtmpl': templ})
             return ydl.prepare_filename(info)
diff --git a/test/test_all_urls.py b/test/test_all_urls.py
index 965e5d8a5..bd4fe17bf 100644
--- a/test/test_all_urls.py
+++ b/test/test_all_urls.py
@@ -32,19 +32,19 @@ class TestAllURLsMatching(unittest.TestCase):
     def test_youtube_playlist_matching(self):
         assertPlaylist = lambda url: self.assertMatch(url, ['youtube:playlist'])
         assertPlaylist('ECUl4u3cNGP61MdtwGTqZA0MreSaDybji8')
-        assertPlaylist('UUBABnxM4Ar9ten8Mdjj1j0Q') #585
+        assertPlaylist('UUBABnxM4Ar9ten8Mdjj1j0Q')  # 585
         assertPlaylist('PL63F0C78739B09958')
         assertPlaylist('https://www.youtube.com/playlist?list=UUBABnxM4Ar9ten8Mdjj1j0Q')
         assertPlaylist('https://www.youtube.com/course?list=ECUl4u3cNGP61MdtwGTqZA0MreSaDybji8')
         assertPlaylist('https://www.youtube.com/playlist?list=PLwP_SiAcdui0KVebT0mU9Apz359a4ubsC')
-        assertPlaylist('https://www.youtube.com/watch?v=AV6J6_AeFEQ&playnext=1&list=PL4023E734DA416012') #668
+        assertPlaylist('https://www.youtube.com/watch?v=AV6J6_AeFEQ&playnext=1&list=PL4023E734DA416012')  # 668
         self.assertFalse('youtube:playlist' in self.matching_ies('PLtS2H6bU1M'))
         # Top tracks
         assertPlaylist('https://www.youtube.com/playlist?list=MCUS.20142101')
 
     def test_youtube_matching(self):
         self.assertTrue(YoutubeIE.suitable('PLtS2H6bU1M'))
-        self.assertFalse(YoutubeIE.suitable('https://www.youtube.com/watch?v=AV6J6_AeFEQ&playnext=1&list=PL4023E734DA416012')) #668
+        self.assertFalse(YoutubeIE.suitable('https://www.youtube.com/watch?v=AV6J6_AeFEQ&playnext=1&list=PL4023E734DA416012'))  # 668
         self.assertMatch('http://youtu.be/BaW_jenozKc', ['youtube'])
         self.assertMatch('http://www.youtube.com/v/BaW_jenozKc', ['youtube'])
         self.assertMatch('https://youtube.googleapis.com/v/BaW_jenozKc', ['youtube'])
diff --git a/test/test_download.py b/test/test_download.py
index 12cfb5cbe..b2615f338 100644
--- a/test/test_download.py
+++ b/test/test_download.py
@@ -40,18 +40,22 @@ from youtube_dl.extractor import get_info_extractor
 
 RETRIES = 3
 
+
 class YoutubeDL(youtube_dl.YoutubeDL):
     def __init__(self, *args, **kwargs):
         self.to_stderr = self.to_screen
         self.processed_info_dicts = []
         super(YoutubeDL, self).__init__(*args, **kwargs)
+
     def report_warning(self, message):
         # Don't accept warnings during tests
         raise ExtractorError(message)
+
     def process_info(self, info_dict):
         self.processed_info_dicts.append(info_dict)
         return super(YoutubeDL, self).process_info(info_dict)
 
+
 def _file_md5(fn):
     with open(fn, 'rb') as f:
         return hashlib.md5(f.read()).hexdigest()
@@ -61,10 +65,13 @@ defs = gettestcases()
 
 class TestDownload(unittest.TestCase):
     maxDiff = None
+
     def setUp(self):
         self.defs = defs
 
-### Dynamically generate tests
+# Dynamically generate tests
+
+
 def generator(test_case):
 
     def test_template(self):
@@ -101,6 +108,7 @@ def generator(test_case):
         ydl = YoutubeDL(params, auto_init=False)
         ydl.add_default_info_extractors()
         finished_hook_called = set()
+
         def _hook(status):
             if status['status'] == 'finished':
                 finished_hook_called.add(status['filename'])
@@ -111,6 +119,7 @@ def generator(test_case):
             return tc.get('file') or ydl.prepare_filename(tc.get('info_dict', {}))
 
         res_dict = None
+
         def try_rm_tcs_files(tcs=None):
             if tcs is None:
                 tcs = test_cases
@@ -206,7 +215,7 @@ def generator(test_case):
 
     return test_template
 
-### And add them to TestDownload
+# And add them to TestDownload
 for n, test_case in enumerate(defs):
     test_method = generator(test_case)
     tname = 'test_' + str(test_case['name'])
diff --git a/test/test_subtitles.py b/test/test_subtitles.py
index 94e3290db..2eeb31bc6 100644
--- a/test/test_subtitles.py
+++ b/test/test_subtitles.py
@@ -23,6 +23,7 @@ from youtube_dl.extractor import (
 class BaseTestSubtitles(unittest.TestCase):
     url = None
     IE = None
+
     def setUp(self):
         self.DL = FakeYDL()
         self.ie = self.IE(self.DL)
diff --git a/test/test_utils.py b/test/test_utils.py
index 9a62322f0..380d1059d 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -120,16 +120,16 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(orderedSet([1, 1, 2, 3, 4, 4, 5, 6, 7, 3, 5]), [1, 2, 3, 4, 5, 6, 7])
         self.assertEqual(orderedSet([]), [])
         self.assertEqual(orderedSet([1]), [1])
-        #keep the list ordered
+        # keep the list ordered
         self.assertEqual(orderedSet([135, 1, 1, 1]), [135, 1])
 
     def test_unescape_html(self):
         self.assertEqual(unescapeHTML('%20;'), '%20;')
         self.assertEqual(
             unescapeHTML('é'), 'é')
-        
+
     def test_daterange(self):
-        _20century = DateRange("19000101","20000101")
+        _20century = DateRange("19000101", "20000101")
         self.assertFalse("17890714" in _20century)
         _ac = DateRange("00010101")
         self.assertTrue("19690721" in _ac)
diff --git a/test/test_write_annotations.py b/test/test_write_annotations.py
index eac53b285..852553ada 100644
--- a/test/test_write_annotations.py
+++ b/test/test_write_annotations.py
@@ -31,19 +31,18 @@ params = get_params({
 })
 
 
-
 TEST_ID = 'gr51aVj-mLg'
 ANNOTATIONS_FILE = TEST_ID + '.flv.annotations.xml'
 EXPECTED_ANNOTATIONS = ['Speech bubble', 'Note', 'Title', 'Spotlight', 'Label']
 
+
 class TestAnnotations(unittest.TestCase):
     def setUp(self):
         # Clear old files
         self.tearDown()
 
-
     def test_info_json(self):
-        expected = list(EXPECTED_ANNOTATIONS) #Two annotations could have the same text.
+        expected = list(EXPECTED_ANNOTATIONS)  # Two annotations could have the same text.
         ie = youtube_dl.extractor.YoutubeIE()
         ydl = YoutubeDL(params)
         ydl.add_info_extractor(ie)
@@ -51,7 +50,7 @@ class TestAnnotations(unittest.TestCase):
         self.assertTrue(os.path.exists(ANNOTATIONS_FILE))
         annoxml = None
         with io.open(ANNOTATIONS_FILE, 'r', encoding='utf-8') as annof:
-                annoxml = xml.etree.ElementTree.parse(annof)
+            annoxml = xml.etree.ElementTree.parse(annof)
         self.assertTrue(annoxml is not None, 'Failed to parse annotations XML')
         root = annoxml.getroot()
         self.assertEqual(root.tag, 'document')
@@ -59,18 +58,17 @@ class TestAnnotations(unittest.TestCase):
         self.assertEqual(annotationsTag.tag, 'annotations')
         annotations = annotationsTag.findall('annotation')
 
-        #Not all the annotations have TEXT children and the annotations are returned unsorted.
+        # Not all the annotations have TEXT children and the annotations are returned unsorted.
         for a in annotations:
-                self.assertEqual(a.tag, 'annotation')
-                if a.get('type') == 'text':
-                        textTag = a.find('TEXT')
-                        text = textTag.text
-                        self.assertTrue(text in expected) #assertIn only added in python 2.7
-                        #remove the first occurance, there could be more than one annotation with the same text
-                        expected.remove(text)
-        #We should have seen (and removed) all the expected annotation texts.
+            self.assertEqual(a.tag, 'annotation')
+            if a.get('type') == 'text':
+                textTag = a.find('TEXT')
+                text = textTag.text
+                self.assertTrue(text in expected)  # assertIn only added in python 2.7
+                # remove the first occurance, there could be more than one annotation with the same text
+                expected.remove(text)
+        # We should have seen (and removed) all the expected annotation texts.
         self.assertEqual(len(expected), 0, 'Not all expected annotations were found.')
-        
 
     def tearDown(self):
         try_rm(ANNOTATIONS_FILE)
diff --git a/test/test_youtube_lists.py b/test/test_youtube_lists.py
index 410f9edc2..452d342ae 100644
--- a/test/test_youtube_lists.py
+++ b/test/test_youtube_lists.py
@@ -31,7 +31,7 @@ class TestYoutubeLists(unittest.TestCase):
         result = ie.extract('https://www.youtube.com/watch?v=FXxLjLQi3Fg&list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re')
         self.assertEqual(result['_type'], 'url')
         self.assertEqual(YoutubeIE().extract_id(result['url']), 'FXxLjLQi3Fg')
-    
+
     def test_youtube_course(self):
         dl = FakeYDL()
         ie = YoutubePlaylistIE(dl)
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index bfa0c6d43..c1a529f13 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -552,7 +552,7 @@ class YoutubeDL(object):
 
             try:
                 ie_result = ie.extract(url)
-                if ie_result is None: # Finished already (backwards compatibility; listformats and friends should be moved here)
+                if ie_result is None:  # Finished already (backwards compatibility; listformats and friends should be moved here)
                     break
                 if isinstance(ie_result, list):
                     # Backwards compatibility: old IE result format
@@ -565,7 +565,7 @@ class YoutubeDL(object):
                     return self.process_ie_result(ie_result, download, extra_info)
                 else:
                     return ie_result
-            except ExtractorError as de: # An error we somewhat expected
+            except ExtractorError as de:  # An error we somewhat expected
                 self.report_error(compat_str(de), de.format_traceback())
                 break
             except MaxDownloadsReached:
@@ -700,6 +700,7 @@ class YoutubeDL(object):
             self.report_warning(
                 'Extractor %s returned a compat_list result. '
                 'It needs to be updated.' % ie_result.get('extractor'))
+
             def _fixup(r):
                 self.add_extra_info(r,
                     {
@@ -1010,7 +1011,7 @@ class YoutubeDL(object):
                     else:
                         self.to_screen('[info] Writing video subtitles to: ' + sub_filename)
                         with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
-                                subfile.write(sub)
+                            subfile.write(sub)
                 except (OSError, IOError):
                     self.report_error('Cannot write subtitles file ' + sub_filename)
                     return
@@ -1111,7 +1112,7 @@ class YoutubeDL(object):
 
         for url in url_list:
             try:
-                #It also downloads the videos
+                # It also downloads the videos
                 res = self.extract_info(url)
             except UnavailableVideoError:
                 self.report_error('unable to download video')
@@ -1428,4 +1429,3 @@ class YoutubeDL(object):
         if encoding is None:
             encoding = preferredencoding()
         return encoding
-
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index f519fae3e..ee3067134 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -128,7 +128,6 @@ def _real_main(argv=None):
             compat_print(desc)
         sys.exit(0)
 
-
     # Conflicting, missing and erroneous options
     if opts.usenetrc and (opts.username is not None or opts.password is not None):
         parser.error('using .netrc conflicts with giving username/password')
@@ -197,7 +196,7 @@ def _real_main(argv=None):
         # In Python 2, sys.argv is a bytestring (also note http://bugs.python.org/issue2128 for Windows systems)
         if opts.outtmpl is not None:
             opts.outtmpl = opts.outtmpl.decode(preferredencoding())
-    outtmpl =((opts.outtmpl is not None and opts.outtmpl)
+    outtmpl = ((opts.outtmpl is not None and opts.outtmpl)
             or (opts.format == '-1' and opts.usetitle and '%(title)s-%(id)s-%(format)s.%(ext)s')
             or (opts.format == '-1' and '%(id)s-%(format)s.%(ext)s')
             or (opts.usetitle and opts.autonumber and '%(autonumber)s-%(title)s-%(id)s.%(ext)s')
@@ -317,7 +316,6 @@ def _real_main(argv=None):
                 ydl.add_post_processor(FFmpegAudioFixPP())
             ydl.add_post_processor(AtomicParsleyPP())
 
-
         # Please keep ExecAfterDownload towards the bottom as it allows the user to modify the final file in any way.
         # So if the user is able to remove the file before your postprocessor runs it might cause a few problems.
         if opts.exec_cmd:
diff --git a/youtube_dl/aes.py b/youtube_dl/aes.py
index e9c5e2152..ccfd73770 100644
--- a/youtube_dl/aes.py
+++ b/youtube_dl/aes.py
@@ -7,10 +7,11 @@ from .utils import bytes_to_intlist, intlist_to_bytes
 
 BLOCK_SIZE_BYTES = 16
 
+
 def aes_ctr_decrypt(data, key, counter):
     """
     Decrypt with aes in counter mode
-    
+
     @param {int[]} data        cipher
     @param {int[]} key         16/24/32-Byte cipher key
     @param {instance} counter  Instance whose next_value function (@returns {int[]}  16-Byte block)
@@ -19,23 +20,24 @@ def aes_ctr_decrypt(data, key, counter):
     """
     expanded_key = key_expansion(key)
     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
-    
-    decrypted_data=[]
+
+    decrypted_data = []
     for i in range(block_count):
         counter_block = counter.next_value()
-        block = data[i*BLOCK_SIZE_BYTES : (i+1)*BLOCK_SIZE_BYTES]
+        block = data[i*BLOCK_SIZE_BYTES: (i+1)*BLOCK_SIZE_BYTES]
         block += [0]*(BLOCK_SIZE_BYTES - len(block))
-        
+
         cipher_counter_block = aes_encrypt(counter_block, expanded_key)
         decrypted_data += xor(block, cipher_counter_block)
     decrypted_data = decrypted_data[:len(data)]
-    
+
     return decrypted_data
 
+
 def aes_cbc_decrypt(data, key, iv):
     """
     Decrypt with aes in CBC mode
-    
+
     @param {int[]} data        cipher
     @param {int[]} key         16/24/32-Byte cipher key
     @param {int[]} iv          16-Byte IV
@@ -43,60 +45,62 @@ def aes_cbc_decrypt(data, key, iv):
     """
     expanded_key = key_expansion(key)
     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
-    
-    decrypted_data=[]
+
+    decrypted_data = []
     previous_cipher_block = iv
     for i in range(block_count):
-        block = data[i*BLOCK_SIZE_BYTES : (i+1)*BLOCK_SIZE_BYTES]
+        block = data[i*BLOCK_SIZE_BYTES: (i+1)*BLOCK_SIZE_BYTES]
         block += [0]*(BLOCK_SIZE_BYTES - len(block))
-        
+
         decrypted_block = aes_decrypt(block, expanded_key)
         decrypted_data += xor(decrypted_block, previous_cipher_block)
         previous_cipher_block = block
     decrypted_data = decrypted_data[:len(data)]
-    
+
     return decrypted_data
 
+
 def key_expansion(data):
     """
     Generate key schedule
-    
+
     @param {int[]} data  16/24/32-Byte cipher key
-    @returns {int[]}     176/208/240-Byte expanded key 
+    @returns {int[]}     176/208/240-Byte expanded key
     """
-    data = data[:] # copy
+    data = data[:]  # copy
     rcon_iteration = 1
     key_size_bytes = len(data)
     expanded_key_size_bytes = (key_size_bytes // 4 + 7) * BLOCK_SIZE_BYTES
-    
+
     while len(data) < expanded_key_size_bytes:
         temp = data[-4:]
         temp = key_schedule_core(temp, rcon_iteration)
         rcon_iteration += 1
-        data += xor(temp, data[-key_size_bytes : 4-key_size_bytes])
-        
+        data += xor(temp, data[-key_size_bytes: 4-key_size_bytes])
+
         for _ in range(3):
             temp = data[-4:]
-            data += xor(temp, data[-key_size_bytes : 4-key_size_bytes])
-        
+            data += xor(temp, data[-key_size_bytes: 4-key_size_bytes])
+
         if key_size_bytes == 32:
             temp = data[-4:]
             temp = sub_bytes(temp)
-            data += xor(temp, data[-key_size_bytes : 4-key_size_bytes])
-        
+            data += xor(temp, data[-key_size_bytes: 4-key_size_bytes])
+
         for _ in range(3 if key_size_bytes == 32  else 2 if key_size_bytes == 24 else 0):
             temp = data[-4:]
-            data += xor(temp, data[-key_size_bytes : 4-key_size_bytes])
+            data += xor(temp, data[-key_size_bytes: 4-key_size_bytes])
     data = data[:expanded_key_size_bytes]
-    
+
     return data
 
+
 def aes_encrypt(data, expanded_key):
     """
     Encrypt one block with aes
-    
+
     @param {int[]} data          16-Byte state
-    @param {int[]} expanded_key  176/208/240-Byte expanded key 
+    @param {int[]} expanded_key  176/208/240-Byte expanded key
     @returns {int[]}             16-Byte cipher
     """
     rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
@@ -107,30 +111,32 @@ def aes_encrypt(data, expanded_key):
         data = shift_rows(data)
         if i != rounds:
             data = mix_columns(data)
-        data = xor(data, expanded_key[i*BLOCK_SIZE_BYTES : (i+1)*BLOCK_SIZE_BYTES])
+        data = xor(data, expanded_key[i*BLOCK_SIZE_BYTES: (i+1)*BLOCK_SIZE_BYTES])
 
     return data
 
+
 def aes_decrypt(data, expanded_key):
     """
     Decrypt one block with aes
-    
+
     @param {int[]} data          16-Byte cipher
     @param {int[]} expanded_key  176/208/240-Byte expanded key
     @returns {int[]}             16-Byte state
     """
     rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
-    
+
     for i in range(rounds, 0, -1):
-        data = xor(data, expanded_key[i*BLOCK_SIZE_BYTES : (i+1)*BLOCK_SIZE_BYTES])
+        data = xor(data, expanded_key[i*BLOCK_SIZE_BYTES: (i+1)*BLOCK_SIZE_BYTES])
         if i != rounds:
             data = mix_columns_inv(data)
         data = shift_rows_inv(data)
         data = sub_bytes_inv(data)
     data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
-    
+
     return data
 
+
 def aes_decrypt_text(data, password, key_size_bytes):
     """
     Decrypt text
@@ -138,33 +144,34 @@ def aes_decrypt_text(data, password, key_size_bytes):
     - The cipher key is retrieved by encrypting the first 16 Byte of 'password'
       with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's)
     - Mode of operation is 'counter'
-    
+
     @param {str} data                    Base64 encoded string
     @param {str,unicode} password        Password (will be encoded with utf-8)
     @param {int} key_size_bytes          Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit
     @returns {str}                       Decrypted data
     """
     NONCE_LENGTH_BYTES = 8
-    
+
     data = bytes_to_intlist(base64.b64decode(data))
     password = bytes_to_intlist(password.encode('utf-8'))
-    
+
     key = password[:key_size_bytes] + [0]*(key_size_bytes - len(password))
     key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES)
-    
+
     nonce = data[:NONCE_LENGTH_BYTES]
     cipher = data[NONCE_LENGTH_BYTES:]
-    
+
     class Counter:
         __value = nonce + [0]*(BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)
+
         def next_value(self):
             temp = self.__value
             self.__value = inc(self.__value)
             return temp
-    
+
     decrypted_data = aes_ctr_decrypt(cipher, key, Counter())
     plaintext = intlist_to_bytes(decrypted_data)
-    
+
     return plaintext
 
 RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
@@ -200,14 +207,14 @@ SBOX_INV = (0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x
             0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
             0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
             0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d)
-MIX_COLUMN_MATRIX = ((0x2,0x3,0x1,0x1),
-                     (0x1,0x2,0x3,0x1),
-                     (0x1,0x1,0x2,0x3),
-                     (0x3,0x1,0x1,0x2))
-MIX_COLUMN_MATRIX_INV = ((0xE,0xB,0xD,0x9),
-                         (0x9,0xE,0xB,0xD),
-                         (0xD,0x9,0xE,0xB),
-                         (0xB,0xD,0x9,0xE))
+MIX_COLUMN_MATRIX = ((0x2, 0x3, 0x1, 0x1),
+                     (0x1, 0x2, 0x3, 0x1),
+                     (0x1, 0x1, 0x2, 0x3),
+                     (0x3, 0x1, 0x1, 0x2))
+MIX_COLUMN_MATRIX_INV = ((0xE, 0xB, 0xD, 0x9),
+                         (0x9, 0xE, 0xB, 0xD),
+                         (0xD, 0x9, 0xE, 0xB),
+                         (0xB, 0xD, 0x9, 0xE))
 RIJNDAEL_EXP_TABLE = (0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35,
                       0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA,
                       0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31,
@@ -241,30 +248,37 @@ RIJNDAEL_LOG_TABLE = (0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6, 0x4b, 0xc7
                       0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89, 0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5,
                       0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18, 0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07)
 
+
 def sub_bytes(data):
     return [SBOX[x] for x in data]
 
+
 def sub_bytes_inv(data):
     return [SBOX_INV[x] for x in data]
 
+
 def rotate(data):
     return data[1:] + [data[0]]
 
+
 def key_schedule_core(data, rcon_iteration):
     data = rotate(data)
     data = sub_bytes(data)
     data[0] = data[0] ^ RCON[rcon_iteration]
-    
+
     return data
 
+
 def xor(data1, data2):
     return [x^y for x, y in zip(data1, data2)]
 
+
 def rijndael_mul(a, b):
-    if(a==0 or b==0):
+    if(a == 0 or b == 0):
         return 0
     return RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[a] + RIJNDAEL_LOG_TABLE[b]) % 0xFF]
 
+
 def mix_column(data, matrix):
     data_mixed = []
     for row in range(4):
@@ -275,33 +289,38 @@ def mix_column(data, matrix):
         data_mixed.append(mixed)
     return data_mixed
 
+
 def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
     data_mixed = []
     for i in range(4):
-        column = data[i*4 : (i+1)*4]
+        column = data[i*4: (i+1)*4]
         data_mixed += mix_column(column, matrix)
     return data_mixed
 
+
 def mix_columns_inv(data):
     return mix_columns(data, MIX_COLUMN_MATRIX_INV)
 
+
 def shift_rows(data):
     data_shifted = []
     for column in range(4):
         for row in range(4):
-            data_shifted.append( data[((column + row) & 0b11) * 4 + row] )
+            data_shifted.append(data[((column + row) & 0b11) * 4 + row])
     return data_shifted
 
+
 def shift_rows_inv(data):
     data_shifted = []
     for column in range(4):
         for row in range(4):
-            data_shifted.append( data[((column - row) & 0b11) * 4 + row] )
+            data_shifted.append(data[((column - row) & 0b11) * 4 + row])
     return data_shifted
 
+
 def inc(data):
-    data = data[:] # copy
-    for i in range(len(data)-1,-1,-1):
+    data = data[:]  # copy
+    for i in range(len(data)-1, -1, -1):
         if data[i] == 255:
             data[i] = 0
         else:
diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index 549206534..9087b4f85 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -10,47 +10,47 @@ import sys
 
 try:
     import urllib.request as compat_urllib_request
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import urllib2 as compat_urllib_request
 
 try:
     import urllib.error as compat_urllib_error
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import urllib2 as compat_urllib_error
 
 try:
     import urllib.parse as compat_urllib_parse
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import urllib as compat_urllib_parse
 
 try:
     from urllib.parse import urlparse as compat_urllib_parse_urlparse
-except ImportError: # Python 2
+except ImportError:  # Python 2
     from urlparse import urlparse as compat_urllib_parse_urlparse
 
 try:
     import urllib.parse as compat_urlparse
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import urlparse as compat_urlparse
 
 try:
     import http.cookiejar as compat_cookiejar
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import cookielib as compat_cookiejar
 
 try:
     import html.entities as compat_html_entities
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import htmlentitydefs as compat_html_entities
 
 try:
     import html.parser as compat_html_parser
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import HTMLParser as compat_html_parser
 
 try:
     import http.client as compat_http_client
-except ImportError: # Python 2
+except ImportError:  # Python 2
     import httplib as compat_http_client
 
 try:
@@ -111,7 +111,7 @@ except ImportError:
 
 try:
     from urllib.parse import parse_qs as compat_parse_qs
-except ImportError: # Python 2
+except ImportError:  # Python 2
     # HACK: The following is the correct parse_qs implementation from cpython 3's stdlib.
     # Python 2's version is apparently totally broken
 
@@ -157,12 +157,12 @@ except ImportError: # Python 2
         return parsed_result
 
 try:
-    compat_str = unicode # Python 2
+    compat_str = unicode  # Python 2
 except NameError:
     compat_str = str
 
 try:
-    compat_chr = unichr # Python 2
+    compat_chr = unichr  # Python 2
 except NameError:
     compat_chr = chr
 
@@ -182,8 +182,10 @@ except ImportError:  # Python < 3.3
 
 
 def compat_ord(c):
-    if type(c) is int: return c
-    else: return ord(c)
+    if type(c) is int:
+        return c
+    else:
+        return ord(c)
 
 
 if sys.version_info >= (3, 0):
@@ -254,7 +256,7 @@ else:
                     drive = ''
                 userhome = os.path.join(drive, compat_getenv('HOMEPATH'))
 
-            if i != 1: #~user
+            if i != 1:  # ~user
                 userhome = os.path.join(os.path.dirname(userhome), path[1:i])
 
             return userhome + path[i:]
diff --git a/youtube_dl/downloader/common.py b/youtube_dl/downloader/common.py
index 7c33004b1..c0af50c59 100644
--- a/youtube_dl/downloader/common.py
+++ b/youtube_dl/downloader/common.py
@@ -81,7 +81,7 @@ class FileDownloader(object):
         if total is None:
             return None
         dif = now - start
-        if current == 0 or dif < 0.001: # One millisecond
+        if current == 0 or dif < 0.001:  # One millisecond
             return None
         rate = float(current) / dif
         return int((float(total) - float(current)) / rate)
@@ -95,7 +95,7 @@ class FileDownloader(object):
     @staticmethod
     def calc_speed(start, now, bytes):
         dif = now - start
-        if bytes == 0 or dif < 0.001: # One millisecond
+        if bytes == 0 or dif < 0.001:  # One millisecond
             return None
         return float(bytes) / dif
 
@@ -108,7 +108,7 @@ class FileDownloader(object):
     @staticmethod
     def best_block_size(elapsed_time, bytes):
         new_min = max(bytes / 2.0, 1.0)
-        new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
+        new_max = min(max(bytes * 2.0, 1.0), 4194304)  # Do not surpass 4 MB
         if elapsed_time < 0.001:
             return int(new_max)
         rate = bytes / elapsed_time
diff --git a/youtube_dl/downloader/hls.py b/youtube_dl/downloader/hls.py
index 68eafa403..0c33d39ee 100644
--- a/youtube_dl/downloader/hls.py
+++ b/youtube_dl/downloader/hls.py
@@ -101,4 +101,3 @@ class NativeHlsFD(FileDownloader):
         })
         self.try_rename(tmpfilename, filename)
         return True
-
diff --git a/youtube_dl/downloader/rtmp.py b/youtube_dl/downloader/rtmp.py
index 17d9631fa..b8e104c59 100644
--- a/youtube_dl/downloader/rtmp.py
+++ b/youtube_dl/downloader/rtmp.py
@@ -180,7 +180,7 @@ class RtmpFD(FileDownloader):
         while (retval == RD_INCOMPLETE or retval == RD_FAILED) and not test and not live:
             prevsize = os.path.getsize(encodeFilename(tmpfilename))
             self.to_screen('[rtmpdump] %s bytes' % prevsize)
-            time.sleep(5.0) # This seems to be needed
+            time.sleep(5.0)  # This seems to be needed
             retval = run_rtmpdump(basic_args + ['-e'] + [[], ['-k', '1']][retval == RD_FAILED])
             cursize = os.path.getsize(encodeFilename(tmpfilename))
             if prevsize == cursize and retval == RD_FAILED:
diff --git a/youtube_dl/extractor/adultswim.py b/youtube_dl/extractor/adultswim.py
index b4b40f2d4..0d05cbb4b 100644
--- a/youtube_dl/extractor/adultswim.py
+++ b/youtube_dl/extractor/adultswim.py
@@ -5,6 +5,7 @@ import re
 
 from .common import InfoExtractor
 
+
 class AdultSwimIE(InfoExtractor):
     _VALID_URL = r'https?://video\.adultswim\.com/(?P<path>.+?)(?:\.html)?(?:\?.*)?(?:#.*)?$'
     _TEST = {
diff --git a/youtube_dl/extractor/aparat.py b/youtube_dl/extractor/aparat.py
index 748608826..56775289b 100644
--- a/youtube_dl/extractor/aparat.py
+++ b/youtube_dl/extractor/aparat.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 
 from __future__ import unicode_literals
 
diff --git a/youtube_dl/extractor/appletrailers.py b/youtube_dl/extractor/appletrailers.py
index 4359b88d1..567a76cf0 100644
--- a/youtube_dl/extractor/appletrailers.py
+++ b/youtube_dl/extractor/appletrailers.py
@@ -70,11 +70,13 @@ class AppleTrailersIE(InfoExtractor):
         uploader_id = mobj.group('company')
 
         playlist_url = compat_urlparse.urljoin(url, 'includes/playlists/itunes.inc')
+
         def fix_html(s):
             s = re.sub(r'(?s)<script[^<]*?>.*?</script>', '', s)
             s = re.sub(r'<img ([^<]*?)>', r'<img \1/>', s)
             # The ' in the onClick attributes are not escaped, it couldn't be parsed
             # like: http://trailers.apple.com/trailers/wb/gravity/
+
             def _clean_json(m):
                 return 'iTunes.playURL(%s);' % m.group(1).replace('\'', '&#39;')
             s = re.sub(self._JSON_RE, _clean_json, s)
diff --git a/youtube_dl/extractor/ard.py b/youtube_dl/extractor/ard.py
index 630b1faa9..967bd865c 100644
--- a/youtube_dl/extractor/ard.py
+++ b/youtube_dl/extractor/ard.py
@@ -192,4 +192,3 @@ class ARDIE(InfoExtractor):
             'upload_date': upload_date,
             'thumbnail': thumbnail,
         }
-
diff --git a/youtube_dl/extractor/arte.py b/youtube_dl/extractor/arte.py
index 3a57ce527..219631b9b 100644
--- a/youtube_dl/extractor/arte.py
+++ b/youtube_dl/extractor/arte.py
@@ -13,7 +13,7 @@ from ..utils import (
     qualities,
 )
 
-# There are different sources of video in arte.tv, the extraction process 
+# There are different sources of video in arte.tv, the extraction process
 # is different for each one. The videos usually expire in 7 days, so we can't
 # add tests.
 
diff --git a/youtube_dl/extractor/audiomack.py b/youtube_dl/extractor/audiomack.py
index 6232d2cd0..eeeec768f 100644
--- a/youtube_dl/extractor/audiomack.py
+++ b/youtube_dl/extractor/audiomack.py
@@ -12,17 +12,17 @@ class AudiomackIE(InfoExtractor):
     _VALID_URL = r'https?://(?:www\.)?audiomack\.com/song/(?P<id>[\w/-]+)'
     IE_NAME = 'audiomack'
     _TESTS = [
-        #hosted on audiomack
+        # hosted on audiomack
         {
             'url': 'http://www.audiomack.com/song/roosh-williams/extraordinary',
             'info_dict':
             {
-                'id' : 'roosh-williams/extraordinary',
+                'id': 'roosh-williams/extraordinary',
                 'ext': 'mp3',
                 'title': 'Roosh Williams - Extraordinary'
             }
         },
-        #hosted on soundcloud via audiomack
+        # hosted on soundcloud via audiomack
         {
             'url': 'http://www.audiomack.com/song/xclusiveszone/take-kare',
             'file': '172419696.mp3',
@@ -49,7 +49,7 @@ class AudiomackIE(InfoExtractor):
             raise ExtractorError("Unable to deduce api url of song")
         realurl = api_response["url"]
 
-        #Audiomack wraps a lot of soundcloud tracks in their branded wrapper
+        # Audiomack wraps a lot of soundcloud tracks in their branded wrapper
         # - if so, pass the work off to the soundcloud extractor
         if SoundcloudIE.suitable(realurl):
             return {'_type': 'url', 'url': realurl, 'ie_key': 'Soundcloud'}
diff --git a/youtube_dl/extractor/bambuser.py b/youtube_dl/extractor/bambuser.py
index de5d4faf3..eab99faaa 100644
--- a/youtube_dl/extractor/bambuser.py
+++ b/youtube_dl/extractor/bambuser.py
@@ -18,7 +18,7 @@ class BambuserIE(InfoExtractor):
     _TEST = {
         'url': 'http://bambuser.com/v/4050584',
         # MD5 seems to be flaky, see https://travis-ci.org/rg3/youtube-dl/jobs/14051016#L388
-        #u'md5': 'fba8f7693e48fd4e8641b3fd5539a641',
+        # u'md5': 'fba8f7693e48fd4e8641b3fd5539a641',
         'info_dict': {
             'id': '4050584',
             'ext': 'flv',
diff --git a/youtube_dl/extractor/bandcamp.py b/youtube_dl/extractor/bandcamp.py
index 1b8da43ca..acddbc8f1 100644
--- a/youtube_dl/extractor/bandcamp.py
+++ b/youtube_dl/extractor/bandcamp.py
@@ -83,12 +83,12 @@ class BandcampIE(InfoExtractor):
         initial_url = mp3_info['url']
         re_url = r'(?P<server>http://(.*?)\.bandcamp\.com)/download/track\?enc=mp3-320&fsig=(?P<fsig>.*?)&id=(?P<id>.*?)&ts=(?P<ts>.*)$'
         m_url = re.match(re_url, initial_url)
-        #We build the url we will use to get the final track url
+        # We build the url we will use to get the final track url
         # This url is build in Bandcamp in the script download_bunde_*.js
         request_url = '%s/statdownload/track?enc=mp3-320&fsig=%s&id=%s&ts=%s&.rand=665028774616&.vrs=1' % (m_url.group('server'), m_url.group('fsig'), video_id, m_url.group('ts'))
         final_url_webpage = self._download_webpage(request_url, video_id, 'Requesting download url')
         # If we could correctly generate the .rand field the url would be
-        #in the "download_url" key
+        # in the "download_url" key
         final_url = re.search(r'"retry_url":"(.*?)"', final_url_webpage).group(1)
 
         return {
diff --git a/youtube_dl/extractor/bbccouk.py b/youtube_dl/extractor/bbccouk.py
index 75e608f99..89476f032 100644
--- a/youtube_dl/extractor/bbccouk.py
+++ b/youtube_dl/extractor/bbccouk.py
@@ -220,4 +220,4 @@ class BBCCoUkIE(SubtitlesInfoExtractor):
             'duration': duration,
             'formats': formats,
             'subtitles': subtitles,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/beeg.py b/youtube_dl/extractor/beeg.py
index 314e37f8b..4e79fea8f 100644
--- a/youtube_dl/extractor/beeg.py
+++ b/youtube_dl/extractor/beeg.py
@@ -40,7 +40,7 @@ class BeegIE(InfoExtractor):
 
         title = self._html_search_regex(
             r'<title>([^<]+)\s*-\s*beeg\.?</title>', webpage, 'title')
-        
+
         description = self._html_search_regex(
             r'<meta name="description" content="([^"]*)"',
             webpage, 'description', fatal=False)
diff --git a/youtube_dl/extractor/bild.py b/youtube_dl/extractor/bild.py
index 0269d1174..77b562d99 100644
--- a/youtube_dl/extractor/bild.py
+++ b/youtube_dl/extractor/bild.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 from __future__ import unicode_literals
 
 from .common import InfoExtractor
diff --git a/youtube_dl/extractor/canalplus.py b/youtube_dl/extractor/canalplus.py
index dddeaa59c..9873728df 100644
--- a/youtube_dl/extractor/canalplus.py
+++ b/youtube_dl/extractor/canalplus.py
@@ -112,4 +112,4 @@ class CanalplusIE(InfoExtractor):
             'like_count': int(infos.find('NB_LIKES').text),
             'comment_count': int(infos.find('NB_COMMENTS').text),
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/cbsnews.py b/youtube_dl/extractor/cbsnews.py
index 0bce7937f..7e47960ab 100644
--- a/youtube_dl/extractor/cbsnews.py
+++ b/youtube_dl/extractor/cbsnews.py
@@ -84,4 +84,4 @@ class CBSNewsIE(InfoExtractor):
             'thumbnail': thumbnail,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/ceskatelevize.py b/youtube_dl/extractor/ceskatelevize.py
index 90a3dddb9..97feb6704 100644
--- a/youtube_dl/extractor/ceskatelevize.py
+++ b/youtube_dl/extractor/ceskatelevize.py
@@ -92,7 +92,7 @@ class CeskaTelevizeIE(InfoExtractor):
         req.add_header('Referer', url)
 
         playlist = self._download_xml(req, video_id)
-        
+
         formats = []
         for i in playlist.find('smilRoot/body'):
             if 'AD' not in i.attrib['id']:
diff --git a/youtube_dl/extractor/channel9.py b/youtube_dl/extractor/channel9.py
index 16d800512..82a48870a 100644
--- a/youtube_dl/extractor/channel9.py
+++ b/youtube_dl/extractor/channel9.py
@@ -5,6 +5,7 @@ import re
 from .common import InfoExtractor
 from ..utils import ExtractorError
 
+
 class Channel9IE(InfoExtractor):
     '''
     Common extractor for channel9.msdn.com.
@@ -31,7 +32,7 @@ class Channel9IE(InfoExtractor):
                 'session_code': 'KOS002',
                 'session_day': 'Day 1',
                 'session_room': 'Arena 1A',
-                'session_speakers': [ 'Ed Blankenship', 'Andrew Coates', 'Brady Gaster', 'Patrick Klug', 'Mads Kristensen' ],
+                'session_speakers': ['Ed Blankenship', 'Andrew Coates', 'Brady Gaster', 'Patrick Klug', 'Mads Kristensen'],
             },
         },
         {
@@ -44,7 +45,7 @@ class Channel9IE(InfoExtractor):
                 'description': 'md5:d1e6ecaafa7fb52a2cacdf9599829f5b',
                 'duration': 1540,
                 'thumbnail': 'http://video.ch9.ms/ch9/87e1/0300391f-a455-4c72-bec3-4422f19287e1/selfservicenuk_512.jpg',
-                'authors': [ 'Mike Wilmot' ],
+                'authors': ['Mike Wilmot'],
             },
         }
     ]
@@ -83,7 +84,7 @@ class Channel9IE(InfoExtractor):
             'format_id': x.group('quality'),
             'format_note': x.group('note'),
             'format': '%s (%s)' % (x.group('quality'), x.group('note')),
-            'filesize': self._restore_bytes(x.group('filesize')), # File size is approximate
+            'filesize': self._restore_bytes(x.group('filesize')),  # File size is approximate
             'preference': self._known_formats.index(x.group('quality')),
             'vcodec': 'none' if x.group('note') == 'Audio only' else None,
         } for x in list(re.finditer(FORMAT_REGEX, html)) if x.group('quality') in self._known_formats]
@@ -202,17 +203,17 @@ class Channel9IE(InfoExtractor):
 
         if slides is not None:
             d = common.copy()
-            d.update({ 'title': title + '-Slides', 'url': slides })
+            d.update({'title': title + '-Slides', 'url': slides})
             result.append(d)
 
         if zip_ is not None:
             d = common.copy()
-            d.update({ 'title': title + '-Zip', 'url': zip_ })
+            d.update({'title': title + '-Zip', 'url': zip_})
             result.append(d)
 
         if len(formats) > 0:
             d = common.copy()
-            d.update({ 'title': title, 'formats': formats })
+            d.update({'title': title, 'formats': formats})
             result.append(d)
 
         return result
@@ -270,5 +271,5 @@ class Channel9IE(InfoExtractor):
             else:
                 raise ExtractorError('Unexpected WT.entryid %s' % page_type, expected=True)
 
-        else: # Assuming list
+        else:  # Assuming list
             return self._extract_list(content_path)
diff --git a/youtube_dl/extractor/clipsyndicate.py b/youtube_dl/extractor/clipsyndicate.py
index 02a1667fa..d07d544ea 100644
--- a/youtube_dl/extractor/clipsyndicate.py
+++ b/youtube_dl/extractor/clipsyndicate.py
@@ -39,6 +39,7 @@ class ClipsyndicateIE(InfoExtractor):
             transform_source=fix_xml_ampersands)
 
         track_doc = pdoc.find('trackList/track')
+
         def find_param(name):
             node = find_xpath_attr(track_doc, './/param', 'name', name)
             if node is not None:
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 93a5a3d57..f0489ede4 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -423,17 +423,18 @@ class InfoExtractor(object):
         """Report attempt to log in."""
         self.to_screen('Logging in')
 
-    #Methods for following #608
+    # Methods for following #608
     @staticmethod
     def url_result(url, ie=None, video_id=None):
         """Returns a url that points to a page that should be processed"""
-        #TODO: ie should be the class used for getting the info
+        # TODO: ie should be the class used for getting the info
         video_info = {'_type': 'url',
                       'url': url,
                       'ie_key': ie}
         if video_id is not None:
             video_info['id'] = video_id
         return video_info
+
     @staticmethod
     def playlist_result(entries, playlist_id=None, playlist_title=None):
         """Returns a playlist"""
@@ -517,7 +518,7 @@ class InfoExtractor(object):
                     raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
             except (IOError, netrc.NetrcParseError) as err:
                 self._downloader.report_warning('parsing .netrc: %s' % compat_str(err))
-        
+
         return (username, password)
 
     def _get_tfa_info(self):
diff --git a/youtube_dl/extractor/cracked.py b/youtube_dl/extractor/cracked.py
index 74b880ffc..cf763ee7e 100644
--- a/youtube_dl/extractor/cracked.py
+++ b/youtube_dl/extractor/cracked.py
@@ -54,7 +54,7 @@ class CrackedIE(InfoExtractor):
 
         return {
             'id': video_id,
-            'url':video_url,
+            'url': video_url,
             'title': title,
             'description': description,
             'timestamp': timestamp,
@@ -62,4 +62,4 @@ class CrackedIE(InfoExtractor):
             'comment_count': comment_count,
             'height': height,
             'width': width,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/crunchyroll.py b/youtube_dl/extractor/crunchyroll.py
index fe1324fe3..c45858160 100644
--- a/youtube_dl/extractor/crunchyroll.py
+++ b/youtube_dl/extractor/crunchyroll.py
@@ -69,11 +69,9 @@ class CrunchyrollIE(SubtitlesInfoExtractor):
         login_request.add_header('Content-Type', 'application/x-www-form-urlencoded')
         self._download_webpage(login_request, None, False, 'Wrong login info')
 
-
     def _real_initialize(self):
         self._login()
 
-
     def _decrypt_subtitles(self, data, iv, id):
         data = bytes_to_intlist(data)
         iv = bytes_to_intlist(iv)
@@ -99,8 +97,10 @@ class CrunchyrollIE(SubtitlesInfoExtractor):
             return shaHash + [0] * 12
 
         key = obfuscate_key(id)
+
         class Counter:
             __value = iv
+
             def next_value(self):
                 temp = self.__value
                 self.__value = inc(self.__value)
@@ -183,7 +183,7 @@ Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
 
         return output
 
-    def _real_extract(self,url):
+    def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
         video_id = mobj.group('video_id')
 
diff --git a/youtube_dl/extractor/dailymotion.py b/youtube_dl/extractor/dailymotion.py
index fd4bc75b2..22cdcdfa5 100644
--- a/youtube_dl/extractor/dailymotion.py
+++ b/youtube_dl/extractor/dailymotion.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 from __future__ import unicode_literals
 
 import re
@@ -18,6 +18,7 @@ from ..utils import (
     unescapeHTML,
 )
 
+
 class DailymotionBaseInfoExtractor(InfoExtractor):
     @staticmethod
     def _build_request(url):
@@ -27,6 +28,7 @@ class DailymotionBaseInfoExtractor(InfoExtractor):
         request.add_header('Cookie', 'ff=off')
         return request
 
+
 class DailymotionIE(DailymotionBaseInfoExtractor, SubtitlesInfoExtractor):
     """Information Extractor for Dailymotion"""
 
diff --git a/youtube_dl/extractor/defense.py b/youtube_dl/extractor/defense.py
index c5529f8d4..3ffed3d44 100644
--- a/youtube_dl/extractor/defense.py
+++ b/youtube_dl/extractor/defense.py
@@ -26,13 +26,13 @@ class DefenseGouvFrIE(InfoExtractor):
         video_id = self._search_regex(
             r"flashvars.pvg_id=\"(\d+)\";",
             webpage, 'ID')
-        
+
         json_url = ('http://static.videos.gouv.fr/brightcovehub/export/json/'
             + video_id)
         info = self._download_webpage(json_url, title,
                                                   'Downloading JSON config')
         video_url = json.loads(info)['renditions'][0]['url']
-        
+
         return {'id': video_id,
                 'ext': 'mp4',
                 'url': video_url,
diff --git a/youtube_dl/extractor/dotsub.py b/youtube_dl/extractor/dotsub.py
index 5ae0ad5b6..70e368021 100644
--- a/youtube_dl/extractor/dotsub.py
+++ b/youtube_dl/extractor/dotsub.py
@@ -27,7 +27,7 @@ class DotsubIE(InfoExtractor):
         video_id = mobj.group('id')
         info_url = "https://dotsub.com/api/media/%s/metadata" % video_id
         info = self._download_json(info_url, video_id)
-        date = time.gmtime(info['dateCreated']/1000) # The timestamp is in miliseconds
+        date = time.gmtime(info['dateCreated']/1000)  # The timestamp is in miliseconds
 
         return {
             'id': video_id,
diff --git a/youtube_dl/extractor/fc2.py b/youtube_dl/extractor/fc2.py
index c663a0f81..6f5d23559 100644
--- a/youtube_dl/extractor/fc2.py
+++ b/youtube_dl/extractor/fc2.py
@@ -40,7 +40,7 @@ class FC2IE(InfoExtractor):
 
         info_url = (
             "http://video.fc2.com/ginfo.php?mimi={1:s}&href={2:s}&v={0:s}&fversion=WIN%2011%2C6%2C602%2C180&from=2&otag=0&upid={0:s}&tk=null&".
-            format(video_id, mimi, compat_urllib_request.quote(refer, safe='').replace('.','%2E')))
+            format(video_id, mimi, compat_urllib_request.quote(refer, safe='').replace('.', '%2E')))
 
         info_webpage = self._download_webpage(
             info_url, video_id, note='Downloading info page')
diff --git a/youtube_dl/extractor/firsttv.py b/youtube_dl/extractor/firsttv.py
index c2e987ff7..3410daa98 100644
--- a/youtube_dl/extractor/firsttv.py
+++ b/youtube_dl/extractor/firsttv.py
@@ -57,4 +57,4 @@ class FirstTVIE(InfoExtractor):
             'duration': int_or_none(duration),
             'like_count': int_or_none(like_count),
             'dislike_count': int_or_none(dislike_count),
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/flickr.py b/youtube_dl/extractor/flickr.py
index e09982e88..5b0bc9d21 100644
--- a/youtube_dl/extractor/flickr.py
+++ b/youtube_dl/extractor/flickr.py
@@ -17,8 +17,8 @@ class FlickrIE(InfoExtractor):
         'info_dict': {
             'id': '5645318632',
             'ext': 'mp4',
-            "description": "Waterfalls in the Springtime at Dark Hollow Waterfalls. These are located just off of Skyline Drive in Virginia. They are only about 6/10 of a mile hike but it is a pretty steep hill and a good climb back up.", 
-            "uploader_id": "forestwander-nature-pictures", 
+            "description": "Waterfalls in the Springtime at Dark Hollow Waterfalls. These are located just off of Skyline Drive in Virginia. They are only about 6/10 of a mile hike but it is a pretty steep hill and a good climb back up.",
+            "uploader_id": "forestwander-nature-pictures",
             "title": "Dark Hollow Waterfalls"
         }
     }
diff --git a/youtube_dl/extractor/fourtube.py b/youtube_dl/extractor/fourtube.py
index 7d56b9be9..24d4e9754 100644
--- a/youtube_dl/extractor/fourtube.py
+++ b/youtube_dl/extractor/fourtube.py
@@ -92,4 +92,4 @@ class FourTubeIE(InfoExtractor):
             'duration': duration,
             'age_limit': 18,
             'webpage_url': webpage_url,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index c7a824c29..2dc801ad9 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -733,7 +733,7 @@ class GenericIE(InfoExtractor):
                 'title': video_title,
                 'id': video_id,
             }
-            
+
         match = re.search(r'(?:id=["\']wistia_|data-wistia-?id=["\']|Wistia\.embed\(["\'])(?P<id>[^"\']+)', webpage)
         if match:
             return {
@@ -1025,4 +1025,3 @@ class GenericIE(InfoExtractor):
                 '_type': 'playlist',
                 'entries': entries,
             }
-
diff --git a/youtube_dl/extractor/globo.py b/youtube_dl/extractor/globo.py
index 66ca37918..6949a57c7 100644
--- a/youtube_dl/extractor/globo.py
+++ b/youtube_dl/extractor/globo.py
@@ -397,4 +397,4 @@ class GloboIE(InfoExtractor):
             'uploader_id': uploader_id,
             'like_count': like_count,
             'formats': formats
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/gorillavid.py b/youtube_dl/extractor/gorillavid.py
index e21e57510..65b153417 100644
--- a/youtube_dl/extractor/gorillavid.py
+++ b/youtube_dl/extractor/gorillavid.py
@@ -69,7 +69,7 @@ class GorillaVidIE(InfoExtractor):
             (?:id="[^"]+"\s+)?
             value="([^"]*)"
             ''', webpage))
-        
+
         if fields['op'] == 'download1':
             post = compat_urllib_parse.urlencode(fields)
 
diff --git a/youtube_dl/extractor/hornbunny.py b/youtube_dl/extractor/hornbunny.py
index 7e7714438..5b6efb27e 100644
--- a/youtube_dl/extractor/hornbunny.py
+++ b/youtube_dl/extractor/hornbunny.py
@@ -37,7 +37,7 @@ class HornBunnyIE(InfoExtractor):
         webpage2 = self._download_webpage(redirect_url, video_id)
         video_url = self._html_search_regex(
             r'flvMask:(.*?);', webpage2, 'video_url')
-        
+
         duration = parse_duration(self._search_regex(
             r'<strong>Runtime:</strong>\s*([0-9:]+)</div>',
             webpage, 'duration', fatal=False))
diff --git a/youtube_dl/extractor/howcast.py b/youtube_dl/extractor/howcast.py
index 6ae04782c..4ddf06409 100644
--- a/youtube_dl/extractor/howcast.py
+++ b/youtube_dl/extractor/howcast.py
@@ -13,7 +13,7 @@ class HowcastIE(InfoExtractor):
         'info_dict': {
             'id': '390161',
             'ext': 'mp4',
-            'description': 'The square knot, also known as the reef knot, is one of the oldest, most basic knots to tie, and can be used in many different ways. Here\'s the proper way to tie a square knot.', 
+            'description': 'The square knot, also known as the reef knot, is one of the oldest, most basic knots to tie, and can be used in many different ways. Here\'s the proper way to tie a square knot.',
             'title': 'How to Tie a Square Knot Properly',
         }
     }
diff --git a/youtube_dl/extractor/imdb.py b/youtube_dl/extractor/imdb.py
index 6108ed552..f2c1c10f5 100644
--- a/youtube_dl/extractor/imdb.py
+++ b/youtube_dl/extractor/imdb.py
@@ -71,7 +71,7 @@ class ImdbListIE(InfoExtractor):
         },
         'playlist_count': 7,
     }
-    
+
     def _real_extract(self, url):
         list_id = self._match_id(url)
         webpage = self._download_webpage(url, list_id)
diff --git a/youtube_dl/extractor/internetvideoarchive.py b/youtube_dl/extractor/internetvideoarchive.py
index 53f9a5f75..c137f4a5d 100644
--- a/youtube_dl/extractor/internetvideoarchive.py
+++ b/youtube_dl/extractor/internetvideoarchive.py
@@ -32,7 +32,7 @@ class InternetVideoArchiveIE(InfoExtractor):
     def _clean_query(query):
         NEEDED_ARGS = ['publishedid', 'customerid']
         query_dic = compat_urlparse.parse_qs(query)
-        cleaned_dic = dict((k,v[0]) for (k,v) in query_dic.items() if k in NEEDED_ARGS)
+        cleaned_dic = dict((k, v[0]) for (k, v) in query_dic.items() if k in NEEDED_ARGS)
         # Other player ids return m3u8 urls
         cleaned_dic['playerid'] = '247'
         cleaned_dic['videokbrate'] = '100000'
diff --git a/youtube_dl/extractor/ivi.py b/youtube_dl/extractor/ivi.py
index 75b543b7c..06af73417 100644
--- a/youtube_dl/extractor/ivi.py
+++ b/youtube_dl/extractor/ivi.py
@@ -102,7 +102,7 @@ class IviIE(InfoExtractor):
         compilation = result['compilation']
         title = result['title']
 
-        title = '%s - %s' % (compilation, title) if compilation is not None else title  
+        title = '%s - %s' % (compilation, title) if compilation is not None else title
 
         previews = result['preview']
         previews.sort(key=lambda fmt: self._known_thumbnails.index(fmt['content_format']))
@@ -152,17 +152,17 @@ class IviCompilationIE(InfoExtractor):
         compilation_id = mobj.group('compilationid')
         season_id = mobj.group('seasonid')
 
-        if season_id is not None: # Season link
+        if season_id is not None:  # Season link
             season_page = self._download_webpage(url, compilation_id, 'Downloading season %s web page' % season_id)
             playlist_id = '%s/season%s' % (compilation_id, season_id)
             playlist_title = self._html_search_meta('title', season_page, 'title')
             entries = self._extract_entries(season_page, compilation_id)
-        else: # Compilation link            
+        else:  # Compilation link
             compilation_page = self._download_webpage(url, compilation_id, 'Downloading compilation web page')
             playlist_id = compilation_id
             playlist_title = self._html_search_meta('title', compilation_page, 'title')
             seasons = re.findall(r'<a href="/watch/%s/season(\d+)">[^<]+</a>' % compilation_id, compilation_page)
-            if len(seasons) == 0: # No seasons in this compilation
+            if len(seasons) == 0:  # No seasons in this compilation
                 entries = self._extract_entries(compilation_page, compilation_id)
             else:
                 entries = []
@@ -172,4 +172,4 @@ class IviCompilationIE(InfoExtractor):
                         compilation_id, 'Downloading season %s web page' % season_id)
                     entries.extend(self._extract_entries(season_page, compilation_id))
 
-        return self.playlist_result(entries, playlist_id, playlist_title)
\ No newline at end of file
+        return self.playlist_result(entries, playlist_id, playlist_title)
diff --git a/youtube_dl/extractor/jadorecettepub.py b/youtube_dl/extractor/jadorecettepub.py
index ace08769b..063e86de4 100644
--- a/youtube_dl/extractor/jadorecettepub.py
+++ b/youtube_dl/extractor/jadorecettepub.py
@@ -45,4 +45,3 @@ class JadoreCettePubIE(InfoExtractor):
             'title': title,
             'description': description,
         }
-
diff --git a/youtube_dl/extractor/jeuxvideo.py b/youtube_dl/extractor/jeuxvideo.py
index 188165966..8094cc2e4 100644
--- a/youtube_dl/extractor/jeuxvideo.py
+++ b/youtube_dl/extractor/jeuxvideo.py
@@ -29,7 +29,7 @@ class JeuxVideoIE(InfoExtractor):
         xml_link = self._html_search_regex(
             r'<param name="flashvars" value="config=(.*?)" />',
             webpage, 'config URL')
-        
+
         video_id = self._search_regex(
             r'http://www\.jeuxvideo\.com/config/\w+/\d+/(.*?)/\d+_player\.xml',
             xml_link, 'video ID')
@@ -38,7 +38,7 @@ class JeuxVideoIE(InfoExtractor):
             xml_link, title, 'Downloading XML config')
         info_json = config.find('format.json').text
         info = json.loads(info_json)['versions'][0]
-        
+
         video_url = 'http://video720.jeuxvideo.com/' + info['file']
 
         return {
diff --git a/youtube_dl/extractor/kankan.py b/youtube_dl/extractor/kankan.py
index 23103b163..dbfe4cc03 100644
--- a/youtube_dl/extractor/kankan.py
+++ b/youtube_dl/extractor/kankan.py
@@ -10,7 +10,7 @@ _md5 = lambda s: hashlib.md5(s.encode('utf-8')).hexdigest()
 
 class KankanIE(InfoExtractor):
     _VALID_URL = r'https?://(?:.*?\.)?kankan\.com/.+?/(?P<id>\d+)\.shtml'
-    
+
     _TEST = {
         'url': 'http://yinyue.kankan.com/vod/48/48863.shtml',
         'file': '48863.flv',
diff --git a/youtube_dl/extractor/kontrtube.py b/youtube_dl/extractor/kontrtube.py
index 8a73ecfa0..41fd62009 100644
--- a/youtube_dl/extractor/kontrtube.py
+++ b/youtube_dl/extractor/kontrtube.py
@@ -63,4 +63,4 @@ class KontrTubeIE(InfoExtractor):
             'duration': duration,
             'view_count': int_or_none(view_count),
             'comment_count': int_or_none(comment_count),
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/ku6.py b/youtube_dl/extractor/ku6.py
index 89013e522..a602980a1 100644
--- a/youtube_dl/extractor/ku6.py
+++ b/youtube_dl/extractor/ku6.py
@@ -30,4 +30,3 @@ class Ku6IE(InfoExtractor):
             'title': title,
             'url': downloadUrl
         }
-
diff --git a/youtube_dl/extractor/laola1tv.py b/youtube_dl/extractor/laola1tv.py
index 102e29f7a..2fd3b4699 100644
--- a/youtube_dl/extractor/laola1tv.py
+++ b/youtube_dl/extractor/laola1tv.py
@@ -75,4 +75,3 @@ class Laola1TvIE(InfoExtractor):
             'categories': categories,
             'ext': 'mp4',
         }
-
diff --git a/youtube_dl/extractor/lifenews.py b/youtube_dl/extractor/lifenews.py
index 8d9491f23..1f1e23dc3 100644
--- a/youtube_dl/extractor/lifenews.py
+++ b/youtube_dl/extractor/lifenews.py
@@ -52,7 +52,7 @@ class LifeNewsIE(InfoExtractor):
             r'<div class=\'comments\'>\s*<span class=\'counter\'>(\d+)</span>', webpage, 'comment count', fatal=False)
 
         upload_date = self._html_search_regex(
-            r'<time datetime=\'([^\']+)\'>', webpage, 'upload date',fatal=False)
+            r'<time datetime=\'([^\']+)\'>', webpage, 'upload date', fatal=False)
         if upload_date is not None:
             upload_date = unified_strdate(upload_date)
 
@@ -71,4 +71,4 @@ class LifeNewsIE(InfoExtractor):
         if len(videos) == 1:
             return make_entry(video_id, videos[0])
         else:
-            return [make_entry(video_id, media, video_number+1) for video_number, media in enumerate(videos)]
\ No newline at end of file
+            return [make_entry(video_id, media, video_number+1) for video_number, media in enumerate(videos)]
diff --git a/youtube_dl/extractor/lynda.py b/youtube_dl/extractor/lynda.py
index 33f34f4e9..97ca4337b 100644
--- a/youtube_dl/extractor/lynda.py
+++ b/youtube_dl/extractor/lynda.py
@@ -109,7 +109,7 @@ class LyndaIE(SubtitlesInfoExtractor):
             'password': password,
             'remember': 'false',
             'stayPut': 'false'
-        }        
+        }
         request = compat_urllib_request.Request(self._LOGIN_URL, compat_urllib_parse.urlencode(login_form))
         login_page = self._download_webpage(request, None, 'Logging in as %s' % username)
 
@@ -117,7 +117,7 @@ class LyndaIE(SubtitlesInfoExtractor):
         m = re.search(r'loginResultJson = \'(?P<json>[^\']+)\';', login_page)
         if m is not None:
             response = m.group('json')
-            response_json = json.loads(response)            
+            response_json = json.loads(response)
             state = response_json['state']
 
             if state == 'notlogged':
@@ -187,7 +187,7 @@ class LyndaCourseIE(InfoExtractor):
         mobj = re.match(self._VALID_URL, url)
         course_path = mobj.group('coursepath')
         course_id = mobj.group('courseid')
-        
+
         page = self._download_webpage('http://www.lynda.com/ajax/player?courseId=%s&type=course' % course_id,
                                       course_id, 'Downloading course JSON')
         course_json = json.loads(page)
@@ -221,4 +221,4 @@ class LyndaCourseIE(InfoExtractor):
 
         course_title = course_json['Title']
 
-        return self.playlist_result(entries, course_id, course_title)
\ No newline at end of file
+        return self.playlist_result(entries, course_id, course_title)
diff --git a/youtube_dl/extractor/m6.py b/youtube_dl/extractor/m6.py
index 1a26b5d57..3d806323a 100644
--- a/youtube_dl/extractor/m6.py
+++ b/youtube_dl/extractor/m6.py
@@ -53,4 +53,4 @@ class M6IE(InfoExtractor):
             'duration': duration,
             'view_count': view_count,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/malemotion.py b/youtube_dl/extractor/malemotion.py
index 8c1966ab2..1abf6e4f8 100644
--- a/youtube_dl/extractor/malemotion.py
+++ b/youtube_dl/extractor/malemotion.py
@@ -7,6 +7,7 @@ from ..utils import (
     compat_urllib_parse,
 )
 
+
 class MalemotionIE(InfoExtractor):
     _VALID_URL = r'^(?:https?://)?malemotion\.com/video/(.+?)\.(?P<id>.+?)(#|$)'
     _TEST = {
diff --git a/youtube_dl/extractor/mdr.py b/youtube_dl/extractor/mdr.py
index 1b8c4a32e..5fdd19027 100644
--- a/youtube_dl/extractor/mdr.py
+++ b/youtube_dl/extractor/mdr.py
@@ -7,7 +7,7 @@ from .common import InfoExtractor
 
 class MDRIE(InfoExtractor):
     _VALID_URL = r'^(?P<domain>https?://(?:www\.)?mdr\.de)/(?:.*)/(?P<type>video|audio)(?P<video_id>[^/_]+)(?:_|\.html)'
-    
+
     # No tests, MDR regularily deletes its videos
     _TEST = {
         'url': 'http://www.mdr.de/fakt/video189002.html',
diff --git a/youtube_dl/extractor/mojvideo.py b/youtube_dl/extractor/mojvideo.py
index 90b460d65..0ba435dc5 100644
--- a/youtube_dl/extractor/mojvideo.py
+++ b/youtube_dl/extractor/mojvideo.py
@@ -55,4 +55,4 @@ class MojvideoIE(InfoExtractor):
             'title': title,
             'thumbnail': thumbnail,
             'duration': duration,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/moniker.py b/youtube_dl/extractor/moniker.py
index 79bb2ca59..1c4f589cc 100644
--- a/youtube_dl/extractor/moniker.py
+++ b/youtube_dl/extractor/moniker.py
@@ -54,7 +54,7 @@ class MonikerIE(InfoExtractor):
 
         title = os.path.splitext(data['fname'])[0]
 
-        #Could be several links with different quality
+        # Could be several links with different quality
         links = re.findall(r'"file" : "?(.+?)",', webpage)
         # Assume the links are ordered in quality
         formats = [{
diff --git a/youtube_dl/extractor/mooshare.py b/youtube_dl/extractor/mooshare.py
index 7d21ea18f..f50e432a3 100644
--- a/youtube_dl/extractor/mooshare.py
+++ b/youtube_dl/extractor/mooshare.py
@@ -111,4 +111,4 @@ class MooshareIE(InfoExtractor):
             'thumbnail': thumbnail,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/motherless.py b/youtube_dl/extractor/motherless.py
index 3621ff99e..97d5da626 100644
--- a/youtube_dl/extractor/motherless.py
+++ b/youtube_dl/extractor/motherless.py
@@ -72,7 +72,7 @@ class MotherlessIE(InfoExtractor):
         like_count = str_to_int(self._html_search_regex(
             r'<strong>Favorited</strong>\s+([^<]+)<',
             webpage, 'like count', fatal=False))
- 
+
         upload_date = self._html_search_regex(
             r'<strong>Uploaded</strong>\s+([^<]+)<', webpage, 'upload date')
         if 'Ago' in upload_date:
diff --git a/youtube_dl/extractor/moviezine.py b/youtube_dl/extractor/moviezine.py
index 43146180a..f130b75c4 100644
--- a/youtube_dl/extractor/moviezine.py
+++ b/youtube_dl/extractor/moviezine.py
@@ -27,7 +27,7 @@ class MoviezineIE(InfoExtractor):
         webpage = self._download_webpage(url, video_id)
         jsplayer = self._download_webpage('http://www.moviezine.se/api/player.js?video=%s' % video_id, video_id, 'Downloading js api player')
 
-        formats =[{
+        formats = [{
             'format_id': 'sd',
             'url': self._html_search_regex(r'file: "(.+?)",', jsplayer, 'file'),
             'quality': 0,
diff --git a/youtube_dl/extractor/movshare.py b/youtube_dl/extractor/movshare.py
index 4191cf7a0..6101063f2 100644
--- a/youtube_dl/extractor/movshare.py
+++ b/youtube_dl/extractor/movshare.py
@@ -24,4 +24,4 @@ class MovShareIE(NovaMovIE):
             'title': 'dissapeared image',
             'description': 'optical illusion  dissapeared image  magic illusion',
         }
-    }
\ No newline at end of file
+    }
diff --git a/youtube_dl/extractor/mpora.py b/youtube_dl/extractor/mpora.py
index 387935d4d..88c9501cd 100644
--- a/youtube_dl/extractor/mpora.py
+++ b/youtube_dl/extractor/mpora.py
@@ -44,7 +44,7 @@ class MporaIE(InfoExtractor):
                     r'_([0-9]+)\.[a-zA-Z0-9]+$', src['src'],
                     False, default=None)
                 vcodec = src['type'].partition('/')[2]
-                
+
                 formats.append({
                     'format_id': encoding_id + '-' + vcodec,
                     'url': src['src'],
diff --git a/youtube_dl/extractor/mtv.py b/youtube_dl/extractor/mtv.py
index 5f0f476b6..b2f37f692 100644
--- a/youtube_dl/extractor/mtv.py
+++ b/youtube_dl/extractor/mtv.py
@@ -60,7 +60,7 @@ class MTVServicesInfoExtractor(InfoExtractor):
         url = response.geturl()
         # Transform the url to get the best quality:
         url = re.sub(r'.+pxE=mp4', 'http://mtvnmobile.vo.llnwd.net/kip0/_pxn=0+_pxK=18639+_pxE=mp4', url, 1)
-        return [{'url': url,'ext': 'mp4'}]
+        return [{'url': url, 'ext': 'mp4'}]
 
     def _extract_video_formats(self, mdoc, mtvn_id):
         if re.match(r'.*/(error_country_block\.swf|geoblock\.mp4)$', mdoc.find('.//src').text) is not None:
@@ -240,7 +240,7 @@ class MTVIE(MTVServicesInfoExtractor):
         uri = mobj.groupdict().get('mgid')
         if uri is None:
             webpage = self._download_webpage(url, video_id)
-    
+
             # Some videos come from Vevo.com
             m_vevo = re.search(r'isVevoVideo = true;.*?vevoVideoId = "(.*?)";',
                                webpage, re.DOTALL)
@@ -248,7 +248,7 @@ class MTVIE(MTVServicesInfoExtractor):
                 vevo_id = m_vevo.group(1);
                 self.to_screen('Vevo video detected: %s' % vevo_id)
                 return self.url_result('vevo:%s' % vevo_id, ie='Vevo')
-    
+
             uri = self._html_search_regex(r'/uri/(.*?)\?', webpage, 'uri')
         return self._get_videos_info(uri)
 
diff --git a/youtube_dl/extractor/muenchentv.py b/youtube_dl/extractor/muenchentv.py
index c7f6beb9c..b4e8ad17e 100644
--- a/youtube_dl/extractor/muenchentv.py
+++ b/youtube_dl/extractor/muenchentv.py
@@ -73,4 +73,3 @@ class MuenchenTVIE(InfoExtractor):
             'is_live': True,
             'thumbnail': thumbnail,
         }
-
diff --git a/youtube_dl/extractor/musicplayon.py b/youtube_dl/extractor/musicplayon.py
index 42d7a82a5..50d92b50a 100644
--- a/youtube_dl/extractor/musicplayon.py
+++ b/youtube_dl/extractor/musicplayon.py
@@ -72,4 +72,4 @@ class MusicPlayOnIE(InfoExtractor):
             'duration': int_or_none(duration),
             'view_count': int_or_none(view_count),
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/muzu.py b/youtube_dl/extractor/muzu.py
index 1772b7f9a..97edd3ef6 100644
--- a/youtube_dl/extractor/muzu.py
+++ b/youtube_dl/extractor/muzu.py
@@ -37,7 +37,7 @@ class MuzuTVIE(InfoExtractor):
         player_info_page = self._download_webpage('http://player.muzu.tv/player/playerInit?ai=%s' % video_id,
                                                   video_id, u'Downloading player info')
         video_info = json.loads(player_info_page)['videos'][0]
-        for quality in ['1080' , '720', '480', '360']:
+        for quality in ['1080', '720', '480', '360']:
             if video_info.get('v%s' % quality):
                 break
 
diff --git a/youtube_dl/extractor/myvideo.py b/youtube_dl/extractor/myvideo.py
index a89153985..956cf8b86 100644
--- a/youtube_dl/extractor/myvideo.py
+++ b/youtube_dl/extractor/myvideo.py
@@ -33,7 +33,7 @@ class MyVideoIE(InfoExtractor):
     # Original Code from: https://github.com/dersphere/plugin.video.myvideo_de.git
     # Released into the Public Domain by Tristan Fischer on 2013-05-19
     # https://github.com/rg3/youtube-dl/pull/842
-    def __rc4crypt(self,data, key):
+    def __rc4crypt(self, data, key):
         x = 0
         box = list(range(256))
         for i in list(range(256)):
@@ -49,10 +49,10 @@ class MyVideoIE(InfoExtractor):
             out += chr(compat_ord(char) ^ box[(box[x] + box[y]) % 256])
         return out
 
-    def __md5(self,s):
+    def __md5(self, s):
         return hashlib.md5(s).hexdigest().encode()
 
-    def _real_extract(self,url):
+    def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
         video_id = mobj.group('id')
 
@@ -173,4 +173,3 @@ class MyVideoIE(InfoExtractor):
             'play_path': video_playpath,
             'player_url': video_swfobj,
         }
-
diff --git a/youtube_dl/extractor/naver.py b/youtube_dl/extractor/naver.py
index cb1af9ecc..5ce35dbf5 100644
--- a/youtube_dl/extractor/naver.py
+++ b/youtube_dl/extractor/naver.py
@@ -40,7 +40,7 @@ class NaverIE(InfoExtractor):
             raise ExtractorError('couldn\'t extract vid and key')
         vid = m_id.group(1)
         key = m_id.group(2)
-        query = compat_urllib_parse.urlencode({'vid': vid, 'inKey': key,})
+        query = compat_urllib_parse.urlencode({'vid': vid, 'inKey': key, })
         query_urls = compat_urllib_parse.urlencode({
             'masterVid': vid,
             'protocol': 'p2p',
@@ -65,7 +65,7 @@ class NaverIE(InfoExtractor):
             if domain.startswith('rtmp'):
                 f.update({
                     'ext': 'flv',
-                    'rtmp_protocol': '1', # rtmpt
+                    'rtmp_protocol': '1',  # rtmpt
                 })
             formats.append(f)
         self._sort_formats(formats)
diff --git a/youtube_dl/extractor/nba.py b/youtube_dl/extractor/nba.py
index 78e650b2d..f69fe0925 100644
--- a/youtube_dl/extractor/nba.py
+++ b/youtube_dl/extractor/nba.py
@@ -39,7 +39,6 @@ class NBAIE(InfoExtractor):
         duration = parse_duration(
             self._html_search_meta('duration', webpage, 'duration', fatal=False))
 
-
         return {
             'id': shortened_video_id,
             'url': video_url,
diff --git a/youtube_dl/extractor/ndr.py b/youtube_dl/extractor/ndr.py
index c31ff8160..f49c66690 100644
--- a/youtube_dl/extractor/ndr.py
+++ b/youtube_dl/extractor/ndr.py
@@ -91,4 +91,4 @@ class NDRIE(InfoExtractor):
             'thumbnail': thumbnail,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/newgrounds.py b/youtube_dl/extractor/newgrounds.py
index 2e72e8915..cd117b04e 100644
--- a/youtube_dl/extractor/newgrounds.py
+++ b/youtube_dl/extractor/newgrounds.py
@@ -23,12 +23,12 @@ class NewgroundsIE(InfoExtractor):
         mobj = re.match(self._VALID_URL, url)
         music_id = mobj.group('id')
         webpage = self._download_webpage(url, music_id)
-        
+
         title = self._html_search_regex(
             r',"name":"([^"]+)",', webpage, 'music title')
         uploader = self._html_search_regex(
             r',"artist":"([^"]+)",', webpage, 'music uploader')
-        
+
         music_url_json_string = self._html_search_regex(
             r'({"url":"[^"]+"),', webpage, 'music url') + '}'
         music_url_json = json.loads(music_url_json_string)
diff --git a/youtube_dl/extractor/newstube.py b/youtube_dl/extractor/newstube.py
index 551bd4d7a..85fcad06b 100644
--- a/youtube_dl/extractor/newstube.py
+++ b/youtube_dl/extractor/newstube.py
@@ -89,4 +89,4 @@ class NewstubeIE(InfoExtractor):
             'thumbnail': thumbnail,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/nfb.py b/youtube_dl/extractor/nfb.py
index ba7b77a46..09dcc8c84 100644
--- a/youtube_dl/extractor/nfb.py
+++ b/youtube_dl/extractor/nfb.py
@@ -93,4 +93,4 @@ class NFBIE(InfoExtractor):
             'uploader': uploader,
             'uploader_id': uploader_id,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/nhl.py b/youtube_dl/extractor/nhl.py
index 82af6e330..31813eb68 100644
--- a/youtube_dl/extractor/nhl.py
+++ b/youtube_dl/extractor/nhl.py
@@ -31,7 +31,7 @@ class NHLBaseInfoExtractor(InfoExtractor):
                 path_url, video_id, 'Downloading final video url')
             video_url = path_doc.find('path').text
         else:
-           video_url = initial_video_url
+            video_url = initial_video_url
 
         join = compat_urlparse.urljoin
         return {
diff --git a/youtube_dl/extractor/noco.py b/youtube_dl/extractor/noco.py
index 7f1bc6377..18c869b39 100644
--- a/youtube_dl/extractor/noco.py
+++ b/youtube_dl/extractor/noco.py
@@ -163,4 +163,4 @@ class NocoIE(InfoExtractor):
             'uploader_id': uploader_id,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/novamov.py b/youtube_dl/extractor/novamov.py
index 2e7ab1e4f..38d05e466 100644
--- a/youtube_dl/extractor/novamov.py
+++ b/youtube_dl/extractor/novamov.py
@@ -66,4 +66,4 @@ class NovaMovIE(InfoExtractor):
             'url': video_url,
             'title': title,
             'description': description
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/nowvideo.py b/youtube_dl/extractor/nowvideo.py
index bfba18418..ecb38de2d 100644
--- a/youtube_dl/extractor/nowvideo.py
+++ b/youtube_dl/extractor/nowvideo.py
@@ -25,4 +25,4 @@ class NowVideoIE(NovaMovIE):
             'title': 'youtubedl test video _BaW_jenozKc.mp4',
             'description': 'Description',
         }
-    }
\ No newline at end of file
+    }
diff --git a/youtube_dl/extractor/ntv.py b/youtube_dl/extractor/ntv.py
index ed60314ec..13c8d79cd 100644
--- a/youtube_dl/extractor/ntv.py
+++ b/youtube_dl/extractor/ntv.py
@@ -145,4 +145,4 @@ class NTVIE(InfoExtractor):
             'duration': duration,
             'view_count': view_count,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/nuvid.py b/youtube_dl/extractor/nuvid.py
index 58ec81f91..449c8a6a3 100644
--- a/youtube_dl/extractor/nuvid.py
+++ b/youtube_dl/extractor/nuvid.py
@@ -71,4 +71,4 @@ class NuvidIE(InfoExtractor):
             'upload_date': upload_date,
             'age_limit': 18,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/nytimes.py b/youtube_dl/extractor/nytimes.py
index 7bf105d38..56e1cad3b 100644
--- a/youtube_dl/extractor/nytimes.py
+++ b/youtube_dl/extractor/nytimes.py
@@ -74,4 +74,4 @@ class NYTimesIE(InfoExtractor):
             'duration': duration,
             'formats': formats,
             'thumbnails': thumbnails,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/ooyala.py b/youtube_dl/extractor/ooyala.py
index 2044e107e..30d80fa6b 100644
--- a/youtube_dl/extractor/ooyala.py
+++ b/youtube_dl/extractor/ooyala.py
@@ -97,4 +97,3 @@ class OoyalaIE(InfoExtractor):
             }
         else:
             return self._extract_result(videos_info[0], videos_more_info)
-        
diff --git a/youtube_dl/extractor/orf.py b/youtube_dl/extractor/orf.py
index 011e6be13..572a234ad 100644
--- a/youtube_dl/extractor/orf.py
+++ b/youtube_dl/extractor/orf.py
@@ -178,4 +178,4 @@ class ORFFM4IE(InfoExtractor):
             'title': data['title'],
             'description': data['subtitle'],
             'entries': entries
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/podomatic.py b/youtube_dl/extractor/podomatic.py
index ffafd2380..f20946a2b 100644
--- a/youtube_dl/extractor/podomatic.py
+++ b/youtube_dl/extractor/podomatic.py
@@ -6,6 +6,7 @@ import re
 from .common import InfoExtractor
 from ..utils import int_or_none
 
+
 class PodomaticIE(InfoExtractor):
     IE_NAME = 'podomatic'
     _VALID_URL = r'^(?P<proto>https?)://(?P<channel>[^.]+)\.podomatic\.com/entry/(?P<id>[^?]+)'
diff --git a/youtube_dl/extractor/pornhub.py b/youtube_dl/extractor/pornhub.py
index 618e8f5dd..2ca15b717 100644
--- a/youtube_dl/extractor/pornhub.py
+++ b/youtube_dl/extractor/pornhub.py
@@ -56,7 +56,7 @@ class PornHubIE(InfoExtractor):
         comment_count = self._extract_count(
             r'All comments \(<var class="videoCommentCount">([\d,\.]+)</var>', webpage, 'comment')
 
-        video_urls = list(map(compat_urllib_parse.unquote , re.findall(r'"quality_[0-9]{3}p":"([^"]+)', webpage)))
+        video_urls = list(map(compat_urllib_parse.unquote, re.findall(r'"quality_[0-9]{3}p":"([^"]+)', webpage)))
         if webpage.find('"encrypted":true') != -1:
             password = compat_urllib_parse.unquote_plus(self._html_search_regex(r'"video_title":"([^"]+)', webpage, 'password'))
             video_urls = list(map(lambda s: aes_decrypt_text(s, password, 32).decode('utf-8'), video_urls))
diff --git a/youtube_dl/extractor/pornotube.py b/youtube_dl/extractor/pornotube.py
index 04bd3d979..5253aa3d3 100644
--- a/youtube_dl/extractor/pornotube.py
+++ b/youtube_dl/extractor/pornotube.py
@@ -38,7 +38,7 @@ class PornotubeIE(InfoExtractor):
         video_url = self._search_regex(VIDEO_URL_RE, webpage, 'video url')
         video_url = compat_urllib_parse.unquote(video_url)
 
-        #Get the uploaded date
+        # Get the uploaded date
         VIDEO_UPLOADED_RE = r'<div class="video_added_by">Added (?P<date>[0-9\/]+) by'
         upload_date = self._html_search_regex(VIDEO_UPLOADED_RE, webpage, 'upload date', fatal=False)
         if upload_date:
diff --git a/youtube_dl/extractor/prosiebensat1.py b/youtube_dl/extractor/prosiebensat1.py
index 619496de7..32d747ede 100644
--- a/youtube_dl/extractor/prosiebensat1.py
+++ b/youtube_dl/extractor/prosiebensat1.py
@@ -280,4 +280,4 @@ class ProSiebenSat1IE(InfoExtractor):
             'upload_date': upload_date,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/rai.py b/youtube_dl/extractor/rai.py
index ba3dd707f..2d39ecfe4 100644
--- a/youtube_dl/extractor/rai.py
+++ b/youtube_dl/extractor/rai.py
@@ -119,4 +119,4 @@ class RaiIE(SubtitlesInfoExtractor):
             if captions.endswith(STL_EXT):
                 captions = captions[:-len(STL_EXT)] + SRT_EXT
             subtitles['it'] = 'http://www.rai.tv%s' % compat_urllib_parse.quote(captions)
-        return subtitles
\ No newline at end of file
+        return subtitles
diff --git a/youtube_dl/extractor/ringtv.py b/youtube_dl/extractor/ringtv.py
index 9fbdb9fcb..59dc137cc 100644
--- a/youtube_dl/extractor/ringtv.py
+++ b/youtube_dl/extractor/ringtv.py
@@ -41,4 +41,3 @@ class RingTVIE(InfoExtractor):
             'thumbnail': thumbnail_url,
             'description': description,
         }
-
diff --git a/youtube_dl/extractor/rtlnow.py b/youtube_dl/extractor/rtlnow.py
index 1a41cbe40..285c3c4be 100644
--- a/youtube_dl/extractor/rtlnow.py
+++ b/youtube_dl/extractor/rtlnow.py
@@ -122,7 +122,7 @@ class RTLnowIE(InfoExtractor):
         playerdata = self._download_xml(playerdata_url, video_id, 'Downloading player data XML')
 
         videoinfo = playerdata.find('./playlist/videoinfo')
-        
+
         formats = []
         for filename in videoinfo.findall('filename'):
             mobj = re.search(r'(?P<url>rtmpe://(?:[^/]+/){2})(?P<play_path>.+)', filename.text)
@@ -153,4 +153,4 @@ class RTLnowIE(InfoExtractor):
             'upload_date': upload_date,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/rtve.py b/youtube_dl/extractor/rtve.py
index 4dd35a47b..0ce22d60c 100644
--- a/youtube_dl/extractor/rtve.py
+++ b/youtube_dl/extractor/rtve.py
@@ -54,7 +54,6 @@ def _decrypt_url(png):
     return url
 
 
-
 class RTVEALaCartaIE(InfoExtractor):
     IE_NAME = 'rtve.es:alacarta'
     IE_DESC = 'RTVE a la carta'
diff --git a/youtube_dl/extractor/rutv.py b/youtube_dl/extractor/rutv.py
index f737b4e5f..a73e6f331 100644
--- a/youtube_dl/extractor/rutv.py
+++ b/youtube_dl/extractor/rutv.py
@@ -191,4 +191,4 @@ class RUTVIE(InfoExtractor):
             'view_count': view_count,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/scivee.py b/youtube_dl/extractor/scivee.py
index 55a481cc0..3bf93c870 100644
--- a/youtube_dl/extractor/scivee.py
+++ b/youtube_dl/extractor/scivee.py
@@ -53,4 +53,4 @@ class SciVeeIE(InfoExtractor):
             'description': description,
             'thumbnail': 'http://www.scivee.tv/assets/videothumb/%s' % video_id,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/servingsys.py b/youtube_dl/extractor/servingsys.py
index 1dc551d5c..16dc3736b 100644
--- a/youtube_dl/extractor/servingsys.py
+++ b/youtube_dl/extractor/servingsys.py
@@ -67,5 +67,3 @@ class ServingSysIE(InfoExtractor):
             'title': title,
             'entries': entries,
         }
-
- 
\ No newline at end of file
diff --git a/youtube_dl/extractor/shared.py b/youtube_dl/extractor/shared.py
index badba2ac6..fdc31603a 100644
--- a/youtube_dl/extractor/shared.py
+++ b/youtube_dl/extractor/shared.py
@@ -54,4 +54,4 @@ class SharedIE(InfoExtractor):
             'filesize': filesize,
             'title': title,
             'thumbnail': thumbnail,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/smotri.py b/youtube_dl/extractor/smotri.py
index 6c1d82dd7..9d2f8d40b 100644
--- a/youtube_dl/extractor/smotri.py
+++ b/youtube_dl/extractor/smotri.py
@@ -212,7 +212,7 @@ class SmotriCommunityIE(InfoExtractor):
         },
         'playlist_mincount': 4,
     }
-    
+
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
         community_id = mobj.group('communityid')
diff --git a/youtube_dl/extractor/soundcloud.py b/youtube_dl/extractor/soundcloud.py
index 54256e1a2..c830d9da7 100644
--- a/youtube_dl/extractor/soundcloud.py
+++ b/youtube_dl/extractor/soundcloud.py
@@ -229,9 +229,9 @@ class SoundcloudIE(InfoExtractor):
             full_title = resolve_title = '%s/%s' % (uploader, slug_title)
             if token:
                 resolve_title += '/%s' % token
-    
+
             self.report_resolve(full_title)
-    
+
             url = 'http://soundcloud.com/%s' % resolve_title
             info_json_url = self._resolv_url(url)
         info = self._download_json(info_json_url, full_title, 'Downloading info JSON')
diff --git a/youtube_dl/extractor/spiegeltv.py b/youtube_dl/extractor/spiegeltv.py
index ef5e7c08b..98cf92d89 100644
--- a/youtube_dl/extractor/spiegeltv.py
+++ b/youtube_dl/extractor/spiegeltv.py
@@ -77,4 +77,4 @@ class SpiegeltvIE(InfoExtractor):
             'description': description,
             'duration': duration,
             'thumbnails': thumbnails
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/sport5.py b/youtube_dl/extractor/sport5.py
index 3f680bfc6..dfe50ed45 100644
--- a/youtube_dl/extractor/sport5.py
+++ b/youtube_dl/extractor/sport5.py
@@ -89,4 +89,4 @@ class Sport5IE(InfoExtractor):
             'duration': duration,
             'categories': categories,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/sportdeutschland.py b/youtube_dl/extractor/sportdeutschland.py
index abb827783..057ef5251 100644
--- a/youtube_dl/extractor/sportdeutschland.py
+++ b/youtube_dl/extractor/sportdeutschland.py
@@ -93,4 +93,3 @@ class SportDeutschlandIE(InfoExtractor):
             'rtmp_live': asset.get('live'),
             'timestamp': parse_iso8601(asset.get('date')),
         }
-
diff --git a/youtube_dl/extractor/subtitles.py b/youtube_dl/extractor/subtitles.py
index db33745c1..41d740e87 100644
--- a/youtube_dl/extractor/subtitles.py
+++ b/youtube_dl/extractor/subtitles.py
@@ -50,7 +50,7 @@ class SubtitlesInfoExtractor(InfoExtractor):
 
             sub_lang_list = {}
             for sub_lang in requested_langs:
-                if not sub_lang in available_subs_list:
+                if sub_lang not in available_subs_list:
                     self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
                     continue
                 sub_lang_list[sub_lang] = available_subs_list[sub_lang]
diff --git a/youtube_dl/extractor/teachertube.py b/youtube_dl/extractor/teachertube.py
index 8a95fd656..6c3445d79 100644
--- a/youtube_dl/extractor/teachertube.py
+++ b/youtube_dl/extractor/teachertube.py
@@ -121,7 +121,7 @@ class TeacherTubeUserIE(InfoExtractor):
         urls = []
         webpage = self._download_webpage(url, user_id)
         urls.extend(re.findall(self._MEDIA_RE, webpage))
-        
+
         pages = re.findall(r'/ajax-user/user-videos/%s\?page=([0-9]+)' % user_id, webpage)[:-1]
         for p in pages:
             more = 'http://www.teachertube.com/ajax-user/user-videos/%s?page=%s' % (user_id, p)
diff --git a/youtube_dl/extractor/teamcoco.py b/youtube_dl/extractor/teamcoco.py
index fa796ce72..d5dda34f6 100644
--- a/youtube_dl/extractor/teamcoco.py
+++ b/youtube_dl/extractor/teamcoco.py
@@ -33,7 +33,7 @@ class TeamcocoIE(InfoExtractor):
 
         display_id = mobj.group('display_id')
         webpage = self._download_webpage(url, display_id)
-        
+
         video_id = mobj.group("video_id")
         if not video_id:
             video_id = self._html_search_regex(
diff --git a/youtube_dl/extractor/telecinco.py b/youtube_dl/extractor/telecinco.py
index db9788c18..2a2fff5e1 100644
--- a/youtube_dl/extractor/telecinco.py
+++ b/youtube_dl/extractor/telecinco.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 from __future__ import unicode_literals
 
 from .mitele import MiTeleIE
diff --git a/youtube_dl/extractor/theplatform.py b/youtube_dl/extractor/theplatform.py
index a04925633..b83d15b90 100644
--- a/youtube_dl/extractor/theplatform.py
+++ b/youtube_dl/extractor/theplatform.py
@@ -35,11 +35,12 @@ class ThePlatformIE(InfoExtractor):
             'skip_download': True,
         },
     }
+
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
         video_id = mobj.group('id')
         if mobj.group('config'):
-            config_url = url+ '&form=json'
+            config_url = url + '&form=json'
             config_url = config_url.replace('swf/', 'config/')
             config_url = config_url.replace('onsite/', 'onsite/config/')
             config = self._download_json(config_url, video_id, 'Downloading config')
@@ -48,7 +49,6 @@ class ThePlatformIE(InfoExtractor):
             smil_url = ('http://link.theplatform.com/s/dJ5BDC/{0}/meta.smil?'
                 'format=smil&mbr=true'.format(video_id))
 
-
         meta = self._download_xml(smil_url, video_id)
         try:
             error_msg = next(
diff --git a/youtube_dl/extractor/thisav.py b/youtube_dl/extractor/thisav.py
index bfb9d2fc9..350a5cdb5 100644
--- a/youtube_dl/extractor/thisav.py
+++ b/youtube_dl/extractor/thisav.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 from __future__ import unicode_literals
 
 import re
@@ -36,7 +36,7 @@ class ThisAVIE(InfoExtractor):
             r': <a href="http://www.thisav.com/user/[0-9]+/([^"]+)">(?:[^<]+)</a>',
             webpage, 'uploader id', fatal=False)
         ext = determine_ext(video_url)
-        
+
         return {
             'id':          video_id,
             'url':         video_url,
diff --git a/youtube_dl/extractor/tinypic.py b/youtube_dl/extractor/tinypic.py
index a4aa25f66..6ba5dc5f1 100644
--- a/youtube_dl/extractor/tinypic.py
+++ b/youtube_dl/extractor/tinypic.py
@@ -26,7 +26,7 @@ class TinyPicIE(InfoExtractor):
         video_id = mobj.group('id')
 
         webpage = self._download_webpage(url, video_id, 'Downloading page')
-        
+
         mobj = re.search(r'(?m)fo\.addVariable\("file",\s"(?P<fileid>[\da-z]+)"\);\n'
             '\s+fo\.addVariable\("s",\s"(?P<serverid>\d+)"\);', webpage)
         if mobj is None:
@@ -47,4 +47,4 @@ class TinyPicIE(InfoExtractor):
             'url': video_url,
             'thumbnail': thumbnail,
             'title': title
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/tnaflix.py b/youtube_dl/extractor/tnaflix.py
index 4956f8577..0ecd695f8 100644
--- a/youtube_dl/extractor/tnaflix.py
+++ b/youtube_dl/extractor/tnaflix.py
@@ -71,7 +71,7 @@ class TNAFlixIE(InfoExtractor):
                 fmt['height'] = int(m.group(1))
             formats.append(fmt)
         self._sort_formats(formats)
-        
+
         return {
             'id': video_id,
             'display_id': display_id,
diff --git a/youtube_dl/extractor/traileraddict.py b/youtube_dl/extractor/traileraddict.py
index 11407428b..b1a440e79 100644
--- a/youtube_dl/extractor/traileraddict.py
+++ b/youtube_dl/extractor/traileraddict.py
@@ -25,7 +25,7 @@ class TrailerAddictIE(InfoExtractor):
         webpage = self._download_webpage(url, name)
 
         title = self._search_regex(r'<title>(.+?)</title>',
-                webpage, 'video title').replace(' - Trailer Addict','')
+                webpage, 'video title').replace(' - Trailer Addict', '')
         view_count_str = self._search_regex(
             r'<span class="views_n">([0-9,.]+)</span>',
             webpage, 'view count', fatal=False)
@@ -43,10 +43,10 @@ class TrailerAddictIE(InfoExtractor):
             fvar = "fvar"
 
         info_url = "http://www.traileraddict.com/%s.php?tid=%s" % (fvar, str(video_id))
-        info_webpage = self._download_webpage(info_url, video_id , "Downloading the info webpage")
+        info_webpage = self._download_webpage(info_url, video_id, "Downloading the info webpage")
 
         final_url = self._search_regex(r'&fileurl=(.+)',
-                info_webpage, 'Download url').replace('%3F','?')
+                info_webpage, 'Download url').replace('%3F', '?')
         thumbnail_url = self._search_regex(r'&image=(.+?)&',
                 info_webpage, 'thumbnail url')
 
diff --git a/youtube_dl/extractor/trilulilu.py b/youtube_dl/extractor/trilulilu.py
index d64aaa41f..2f2c8aeda 100644
--- a/youtube_dl/extractor/trilulilu.py
+++ b/youtube_dl/extractor/trilulilu.py
@@ -39,7 +39,7 @@ class TriluliluIE(InfoExtractor):
             format_url, video_id,
             note=u'Downloading formats',
             errnote=u'Error while downloading formats')
- 
+
         video_url_template = (
             u'http://fs%(server)s.trilulilu.ro/stream.php?type=video'
             u'&source=site&hash=%(hash)s&username=%(userid)s&'
@@ -63,4 +63,3 @@ class TriluliluIE(InfoExtractor):
             'description': description,
             'thumbnail': thumbnail,
         }
-
diff --git a/youtube_dl/extractor/tudou.py b/youtube_dl/extractor/tudou.py
index dcd823d08..c8780790a 100644
--- a/youtube_dl/extractor/tudou.py
+++ b/youtube_dl/extractor/tudou.py
@@ -41,7 +41,7 @@ class TudouIE(InfoExtractor):
         if quality:
             info_url += '&hd' + quality
         webpage = self._download_webpage(info_url, id, "Opening the info webpage")
-        final_url = self._html_search_regex('>(.+?)</f>',webpage, 'video url')
+        final_url = self._html_search_regex('>(.+?)</f>', webpage, 'video url')
         return final_url
 
     def _real_extract(self, url):
diff --git a/youtube_dl/extractor/tvigle.py b/youtube_dl/extractor/tvigle.py
index 27962b5fe..d81d1d1a6 100644
--- a/youtube_dl/extractor/tvigle.py
+++ b/youtube_dl/extractor/tvigle.py
@@ -84,4 +84,4 @@ class TvigleIE(InfoExtractor):
             'duration': duration,
             'age_limit': age_limit,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/udemy.py b/youtube_dl/extractor/udemy.py
index 054f42725..7df11fc19 100644
--- a/youtube_dl/extractor/udemy.py
+++ b/youtube_dl/extractor/udemy.py
@@ -161,4 +161,4 @@ class UdemyCourseIE(UdemyIE):
             for asset in response if asset.get('assetType') == 'Video'
         ]
 
-        return self.playlist_result(entries, course_id, course_title)
\ No newline at end of file
+        return self.playlist_result(entries, course_id, course_title)
diff --git a/youtube_dl/extractor/vesti.py b/youtube_dl/extractor/vesti.py
index 27f9acb67..5aebcecd7 100644
--- a/youtube_dl/extractor/vesti.py
+++ b/youtube_dl/extractor/vesti.py
@@ -118,4 +118,4 @@ class VestiIE(InfoExtractor):
         if rutv_url:
             return self.url_result(rutv_url, 'RUTV')
 
-        raise ExtractorError('No video found', expected=True)
\ No newline at end of file
+        raise ExtractorError('No video found', expected=True)
diff --git a/youtube_dl/extractor/vgtv.py b/youtube_dl/extractor/vgtv.py
index d3fa70e0e..70578a4cc 100644
--- a/youtube_dl/extractor/vgtv.py
+++ b/youtube_dl/extractor/vgtv.py
@@ -114,4 +114,4 @@ class VGTVIE(InfoExtractor):
             'duration': float_or_none(data['duration'], 1000),
             'view_count': data['displays'],
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/vice.py b/youtube_dl/extractor/vice.py
index f11ca8217..71f520fb5 100644
--- a/youtube_dl/extractor/vice.py
+++ b/youtube_dl/extractor/vice.py
@@ -35,4 +35,3 @@ class ViceIE(InfoExtractor):
         except ExtractorError:
             raise ExtractorError('The page doesn\'t contain a video', expected=True)
         return self.url_result(ooyala_url, ie='Ooyala')
-
diff --git a/youtube_dl/extractor/videobam.py b/youtube_dl/extractor/videobam.py
index fed95ef71..0eb3d9414 100644
--- a/youtube_dl/extractor/videobam.py
+++ b/youtube_dl/extractor/videobam.py
@@ -78,4 +78,4 @@ class VideoBamIE(InfoExtractor):
             'view_count': view_count,
             'formats': formats,
             'age_limit': 18,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/videofyme.py b/youtube_dl/extractor/videofyme.py
index f75169041..2dd51d866 100644
--- a/youtube_dl/extractor/videofyme.py
+++ b/youtube_dl/extractor/videofyme.py
@@ -6,6 +6,7 @@ from ..utils import (
     determine_ext,
 )
 
+
 class VideofyMeIE(InfoExtractor):
     _VALID_URL = r'https?://(www\.videofy\.me/.+?|p\.videofy\.me/v)/(?P<id>\d+)(&|#|$)'
     IE_NAME = u'videofy.me'
@@ -20,7 +21,7 @@ class VideofyMeIE(InfoExtractor):
             u'uploader': u'VideofyMe',
             u'uploader_id': u'thisisvideofyme',
         },
-        
+
     }
 
     def _real_extract(self, url):
@@ -30,7 +31,7 @@ class VideofyMeIE(InfoExtractor):
                                             video_id)
         video = config.find('video')
         sources = video.find('sources')
-        url_node = next(node for node in [find_xpath_attr(sources, 'source', 'id', 'HQ %s' % key) 
+        url_node = next(node for node in [find_xpath_attr(sources, 'source', 'id', 'HQ %s' % key)
             for key in ['on', 'av', 'off']] if node is not None)
         video_url = url_node.find('url').text
 
diff --git a/youtube_dl/extractor/videott.py b/youtube_dl/extractor/videott.py
index a647807d0..1f938838c 100644
--- a/youtube_dl/extractor/videott.py
+++ b/youtube_dl/extractor/videott.py
@@ -58,4 +58,4 @@ class VideoTtIE(InfoExtractor):
             'like_count': int_or_none(video['liked']),
             'dislike_count': int_or_none(video['disliked']),
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/videoweed.py b/youtube_dl/extractor/videoweed.py
index 4a08ddd43..ca2e50935 100644
--- a/youtube_dl/extractor/videoweed.py
+++ b/youtube_dl/extractor/videoweed.py
@@ -23,4 +23,4 @@ class VideoWeedIE(NovaMovIE):
             'title': 'optical illusion  dissapeared image magic illusion',
             'description': ''
         },
-    }
\ No newline at end of file
+    }
diff --git a/youtube_dl/extractor/vidzi.py b/youtube_dl/extractor/vidzi.py
index 669979e13..08a5a7b8d 100644
--- a/youtube_dl/extractor/vidzi.py
+++ b/youtube_dl/extractor/vidzi.py
@@ -1,4 +1,4 @@
-#coding: utf-8
+# coding: utf-8
 from __future__ import unicode_literals
 
 from .common import InfoExtractor
@@ -18,16 +18,15 @@ class VidziIE(InfoExtractor):
 
     def _real_extract(self, url):
         video_id = self._match_id(url)
-        
+
         webpage = self._download_webpage(url, video_id)
         video_url = self._html_search_regex(
             r'{\s*file\s*:\s*"([^"]+)"\s*}', webpage, 'video url')
         title = self._html_search_regex(
             r'(?s)<h2 class="video-title">(.*?)</h2>', webpage, 'title')
-        
+
         return {
             'id': video_id,
             'title': title,
             'url': video_url,
         }
-        
\ No newline at end of file
diff --git a/youtube_dl/extractor/vrt.py b/youtube_dl/extractor/vrt.py
index 57ef8dc30..bbd3bbf7b 100644
--- a/youtube_dl/extractor/vrt.py
+++ b/youtube_dl/extractor/vrt.py
@@ -36,7 +36,7 @@ class VRTIE(InfoExtractor):
                 'timestamp': 1413835980.560,
                 'upload_date': '20141020',
                 'duration': 3238,
-            }  
+            }
         },
         # cobra.be
         {
@@ -92,4 +92,4 @@ class VRTIE(InfoExtractor):
             'timestamp': timestamp,
             'duration': duration,
             'formats': formats,
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/wdr.py b/youtube_dl/extractor/wdr.py
index 54d37da61..93a6e6454 100644
--- a/youtube_dl/extractor/wdr.py
+++ b/youtube_dl/extractor/wdr.py
@@ -224,4 +224,4 @@ class WDRMausIE(InfoExtractor):
             'upload_date': upload_date,
         }
 
-# TODO test _1
\ No newline at end of file
+# TODO test _1
diff --git a/youtube_dl/extractor/worldstarhiphop.py b/youtube_dl/extractor/worldstarhiphop.py
index bda3870db..d5c26a032 100644
--- a/youtube_dl/extractor/worldstarhiphop.py
+++ b/youtube_dl/extractor/worldstarhiphop.py
@@ -51,4 +51,3 @@ class WorldStarHipHopIE(InfoExtractor):
             'title': video_title,
             'thumbnail': thumbnail,
         }
-
diff --git a/youtube_dl/extractor/xbef.py b/youtube_dl/extractor/xbef.py
index 71bd7c463..1b4e88365 100644
--- a/youtube_dl/extractor/xbef.py
+++ b/youtube_dl/extractor/xbef.py
@@ -47,4 +47,3 @@ class XBefIE(InfoExtractor):
             'thumbnail': thumbnail,
             'age_limit': 18,
         }
-
diff --git a/youtube_dl/extractor/xhamster.py b/youtube_dl/extractor/xhamster.py
index 4e8fbde8d..1e6c94623 100644
--- a/youtube_dl/extractor/xhamster.py
+++ b/youtube_dl/extractor/xhamster.py
@@ -42,7 +42,7 @@ class XHamsterIE(InfoExtractor):
         }
     ]
 
-    def _real_extract(self,url):
+    def _real_extract(self, url):
         def extract_video_url(webpage):
             mp4 = re.search(r'<video\s+.*?file="([^"]+)".*?>', webpage)
             if mp4 is None:
diff --git a/youtube_dl/extractor/ynet.py b/youtube_dl/extractor/ynet.py
index 9cd7989cc..7b621a9e3 100644
--- a/youtube_dl/extractor/ynet.py
+++ b/youtube_dl/extractor/ynet.py
@@ -47,4 +47,4 @@ class YnetIE(InfoExtractor):
             'title': title,
             'formats': self._extract_f4m_formats(f4m_url, video_id),
             'thumbnail': self._og_search_thumbnail(webpage),
-        }
\ No newline at end of file
+        }
diff --git a/youtube_dl/extractor/youku.py b/youtube_dl/extractor/youku.py
index 48d47a245..e155b3a94 100644
--- a/youtube_dl/extractor/youku.py
+++ b/youtube_dl/extractor/youku.py
@@ -35,10 +35,10 @@ class YoukuIE(InfoExtractor):
 
     def _gen_sid(self):
         nowTime = int(time.time() * 1000)
-        random1 = random.randint(1000,1998)
-        random2 = random.randint(1000,9999)
+        random1 = random.randint(1000, 1998)
+        random2 = random.randint(1000, 9999)
 
-        return "%d%d%d" %(nowTime,random1,random2)
+        return "%d%d%d" % (nowTime, random1, random2)
 
     def _get_file_ID_mix_string(self, seed):
         mixed = []
@@ -49,7 +49,7 @@ class YoukuIE(InfoExtractor):
             index  =  math.floor(seed / 65536 * len(source))
             mixed.append(source[int(index)])
             source.remove(source[int(index)])
-        #return ''.join(mixed)
+        # return ''.join(mixed)
         return mixed
 
     def _get_file_id(self, fileId, seed):
@@ -100,12 +100,12 @@ class YoukuIE(InfoExtractor):
         keys = [s['k'] for s in config['data'][0]['segs'][format]]
         # segs is usually a dictionary, but an empty *list* if an error occured.
 
-        files_info=[]
+        files_info = []
         sid = self._gen_sid()
         fileid = self._get_file_id(fileid, seed)
 
-        #column 8,9 of fileid represent the segment number
-        #fileid[7:9] should be changed
+        # column 8,9 of fileid represent the segment number
+        # fileid[7:9] should be changed
         for index, key in enumerate(keys):
             temp_fileid = '%s%02X%s' % (fileid[0:8], index, fileid[10:])
             download_url = 'http://k.youku.com/player/getFlvPath/sid/%s_%02X/st/flv/fileid/%s?k=%s' % (sid, index, temp_fileid, key)
diff --git a/youtube_dl/extractor/youporn.py b/youtube_dl/extractor/youporn.py
index 7bfda45e7..ee61e2381 100644
--- a/youtube_dl/extractor/youporn.py
+++ b/youtube_dl/extractor/youporn.py
@@ -73,7 +73,7 @@ class YouPornIE(InfoExtractor):
         for encrypted_link in encrypted_links:
             link = aes_decrypt_text(encrypted_link, video_title, 32).decode('utf-8')
             links.append(link)
-        
+
         formats = []
         for link in links:
             # A link looks like this:
@@ -104,7 +104,7 @@ class YouPornIE(InfoExtractor):
 
         if not formats:
             raise ExtractorError(u'ERROR: no known formats available for video')
-        
+
         return {
             'id': video_id,
             'uploader': video_uploader,
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 0cb837afc..98cac7c17 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -33,6 +33,7 @@ from ..utils import (
     uppercase_escape,
 )
 
+
 class YoutubeBaseInfoExtractor(InfoExtractor):
     """Provide base functions for Youtube extractors"""
     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
@@ -99,7 +100,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
 
         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
         # chokes on unicode
-        login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
+        login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k, v in login_form_strs.items())
         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 
         req = compat_urllib_request.Request(self._LOGIN_URL, login_data)
@@ -149,7 +150,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
                 'service': 'youtube',
                 'hl': 'en_US',
             }
-            tfa_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in tfa_form_strs.items())
+            tfa_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k, v in tfa_form_strs.items())
             tfa_data = compat_urllib_parse.urlencode(tfa_form).encode('ascii')
 
             tfa_req = compat_urllib_request.Request(self._TWOFACTOR_URL, tfa_data)
@@ -618,7 +619,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             list_url = caption_url + '&' + list_params
             caption_list = self._download_xml(list_url, video_id)
             original_lang_node = caption_list.find('track')
-            if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr' :
+            if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr':
                 self._downloader.report_warning('Video doesn\'t have automatic captions')
                 return {}
             original_lang = original_lang_node.attrib['lang_code']
@@ -651,6 +652,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 
     def _extract_from_m3u8(self, manifest_url, video_id):
         url_map = {}
+
         def _get_urls(_manifest):
             lines = _manifest.split('\n')
             urls = filter(lambda l: l and not l.startswith('#'),
@@ -850,7 +852,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         # annotations
         video_annotations = None
         if self._downloader.params.get('writeannotations', False):
-                video_annotations = self._extract_annotations(video_id)
+            video_annotations = self._extract_annotations(video_id)
 
         # Decide which formats to download
         try:
@@ -900,7 +902,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                 'player_url': player_url,
             }]
         elif len(video_info.get('url_encoded_fmt_stream_map', [])) >= 1 or len(video_info.get('adaptive_fmts', [])) >= 1:
-            encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts',[''])[0]
+            encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts', [''])[0]
             if 'rtmpe%3Dyes' in encoded_url_map:
                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
             url_map = {}
@@ -974,6 +976,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                     dash_manifest_url = video_info.get('dashmpd')[0]
                 else:
                     dash_manifest_url = ytplayer_config['args']['dashmpd']
+
                 def decrypt_sig(mobj):
                     s = mobj.group(1)
                     dec_s = self._decrypt_signature(s, video_id, player_url, age_gate)
@@ -1033,6 +1036,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             'formats':      formats,
         }
 
+
 class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
     IE_DESC = 'YouTube.com playlists'
     _VALID_URL = r"""(?x)(?:
@@ -1046,7 +1050,7 @@ class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
                         )
                         (
                             (?:PL|LL|EC|UU|FL|RD)?[0-9A-Za-z-_]{10,}
-                            # Top tracks, they can also include dots 
+                            # Top tracks, they can also include dots
                             |(?:MC)[\w\.]*
                         )
                         .*
@@ -1230,7 +1234,7 @@ class YoutubeTopListIE(YoutubePlaylistIE):
                 <span[^>]*>.*?%s.*?</span>''' % re.escape(query),
             channel_page, 'list')
         url = compat_urlparse.urljoin('https://www.youtube.com/', link)
-        
+
         video_re = r'data-index="\d+".*?data-video-id="([0-9A-Za-z_-]{11})"'
         ids = []
         # sometimes the webpage doesn't contain the videos
@@ -1298,7 +1302,7 @@ class YoutubeChannelIE(InfoExtractor):
 
                 ids_in_page = self.extract_videos_from_page(page['content_html'])
                 video_ids.extend(ids_in_page)
-    
+
                 if self._MORE_PAGES_INDICATOR not in page['load_more_widget_html']:
                     break
 
@@ -1333,8 +1337,10 @@ class YoutubeUserIE(InfoExtractor):
         # Don't return True if the url can be extracted with other youtube
         # extractor, the regex would is too permissive and it would match.
         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
-        if any(ie.suitable(url) for ie in other_ies): return False
-        else: return super(YoutubeUserIE, cls).suitable(url)
+        if any(ie.suitable(url) for ie in other_ies):
+            return False
+        else:
+            return super(YoutubeUserIE, cls).suitable(url)
 
     def _real_extract(self, url):
         # Extract username
@@ -1557,12 +1563,14 @@ class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
             paging = mobj.group('paging')
         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
 
+
 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
     IE_DESC = 'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
     _FEED_NAME = 'recommended'
     _PLAYLIST_TITLE = 'Youtube Recommended videos'
 
+
 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
     IE_DESC = 'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
@@ -1570,6 +1578,7 @@ class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
     _PLAYLIST_TITLE = 'Youtube Watch Later'
     _PERSONAL_FEED = True
 
+
 class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
     IE_DESC = 'Youtube watch history, "ythistory" keyword (requires authentication)'
     _VALID_URL = 'https?://www\.youtube\.com/feed/history|:ythistory'
@@ -1577,6 +1586,7 @@ class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
     _PERSONAL_FEED = True
     _PLAYLIST_TITLE = 'Youtube Watch History'
 
+
 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
     IE_NAME = 'youtube:favorites'
     IE_DESC = 'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index 16aa6ffca..38177c1d7 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -621,7 +621,7 @@ def parseOpts(overrideArguments=None):
     postproc.add_option(
         '--exec',
         metavar='CMD', dest='exec_cmd',
-        help='Execute a command on the file after downloading, similar to find\'s -exec syntax. Example: --exec \'adb push {} /sdcard/Music/ && rm {}\'' )
+        help='Execute a command on the file after downloading, similar to find\'s -exec syntax. Example: --exec \'adb push {} /sdcard/Music/ && rm {}\'')
 
     parser.add_option_group(general)
     parser.add_option_group(selection)
diff --git a/youtube_dl/postprocessor/execafterdownload.py b/youtube_dl/postprocessor/execafterdownload.py
index baf1b1945..09db43611 100644
--- a/youtube_dl/postprocessor/execafterdownload.py
+++ b/youtube_dl/postprocessor/execafterdownload.py
@@ -26,4 +26,3 @@ class ExecAfterDownloadPP(PostProcessor):
                 'Command returned error code %d' % retCode)
 
         return None, information  # by default, keep file and do nothing
-
diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index f3f2743c0..dfae735f3 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -202,7 +202,7 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
                 extension = 'wav'
                 more_opts += ['-f', 'wav']
 
-        prefix, sep, ext = path.rpartition(u'.') # not os.path.splitext, since the latter does not work on unicode in all setups
+        prefix, sep, ext = path.rpartition(u'.')  # not os.path.splitext, since the latter does not work on unicode in all setups
         new_path = prefix + sep + extension
 
         # If we download foo.mp3 and convert it to... foo.mp3, then don't delete foo.mp3, silly.
@@ -216,7 +216,7 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
                 self._downloader.to_screen(u'[' + self._executable + '] Destination: ' + new_path)
                 self.run_ffmpeg(path, new_path, acodec, more_opts)
         except:
-            etype,e,tb = sys.exc_info()
+            etype, e, tb = sys.exc_info()
             if isinstance(e, AudioConversionError):
                 msg = u'audio conversion failed: ' + e.msg
             else:
@@ -231,13 +231,13 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
                 self._downloader.report_warning(u'Cannot update utime of audio file')
 
         information['filepath'] = new_path
-        return self._nopostoverwrites,information
+        return self._nopostoverwrites, information
 
 
 class FFmpegVideoConvertor(FFmpegPostProcessor):
-    def __init__(self, downloader=None,preferedformat=None):
+    def __init__(self, downloader=None, preferedformat=None):
         super(FFmpegVideoConvertor, self).__init__(downloader)
-        self._preferedformat=preferedformat
+        self._preferedformat = preferedformat
 
     def run(self, information):
         path = information['filepath']
@@ -245,13 +245,13 @@ class FFmpegVideoConvertor(FFmpegPostProcessor):
         outpath = prefix + sep + self._preferedformat
         if information['ext'] == self._preferedformat:
             self._downloader.to_screen(u'[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
-            return True,information
-        self._downloader.to_screen(u'['+'ffmpeg'+'] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) +outpath)
+            return True, information
+        self._downloader.to_screen(u'['+'ffmpeg'+'] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
         self.run_ffmpeg(path, outpath, [])
         information['filepath'] = outpath
         information['format'] = self._preferedformat
         information['ext'] = self._preferedformat
-        return False,information
+        return False, information
 
 
 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
@@ -457,7 +457,7 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
             self._downloader.to_screen(u'[ffmpeg] Subtitles can only be embedded in mp4 files')
             return True, information
         if not information.get('subtitles'):
-            self._downloader.to_screen(u'[ffmpeg] There aren\'t any subtitles to embed') 
+            self._downloader.to_screen(u'[ffmpeg] There aren\'t any subtitles to embed')
             return True, information
 
         sub_langs = [key for key in information['subtitles']]
diff --git a/youtube_dl/postprocessor/xattrpp.py b/youtube_dl/postprocessor/xattrpp.py
index b5cae41c8..d1991c4f8 100644
--- a/youtube_dl/postprocessor/xattrpp.py
+++ b/youtube_dl/postprocessor/xattrpp.py
@@ -108,4 +108,3 @@ class XAttrMetadataPP(PostProcessor):
         except (subprocess.CalledProcessError, OSError):
             self._downloader.report_error("This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)")
             return False, info
-
diff --git a/youtube_dl/swfinterp.py b/youtube_dl/swfinterp.py
index 99220940f..2bd264b30 100644
--- a/youtube_dl/swfinterp.py
+++ b/youtube_dl/swfinterp.py
@@ -827,4 +827,3 @@ class SWFInterpreter(object):
 
         avm_class.method_pyfunctions[func_name] = resfunc
         return resfunc
-
diff --git a/youtube_dl/update.py b/youtube_dl/update.py
index 273083761..d32a86708 100644
--- a/youtube_dl/update.py
+++ b/youtube_dl/update.py
@@ -13,13 +13,17 @@ from .utils import (
 )
 from .version import __version__
 
+
 def rsa_verify(message, signature, key):
     from struct import pack
     from hashlib import sha256
     from sys import version_info
+
     def b(x):
-        if version_info[0] == 2: return x
-        else: return x.encode('latin1')
+        if version_info[0] == 2:
+            return x
+        else:
+            return x.encode('latin1')
     assert(type(message) == type(b('')))
     block_size = 0
     n = key[0]
@@ -32,13 +36,17 @@ def rsa_verify(message, signature, key):
         raw_bytes.insert(0, pack("B", signature & 0xFF))
         signature >>= 8
     signature = (block_size - len(raw_bytes)) * b('\x00') + b('').join(raw_bytes)
-    if signature[0:2] != b('\x00\x01'): return False
+    if signature[0:2] != b('\x00\x01'):
+        return False
     signature = signature[2:]
-    if not b('\x00') in signature: return False
+    if not b('\x00') in signature:
+        return False
     signature = signature[signature.index(b('\x00'))+1:]
-    if not signature.startswith(b('\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20')): return False
+    if not signature.startswith(b('\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20')):
+        return False
     signature = signature[19:]
-    if signature != sha256(message).digest(): return False
+    if signature != sha256(message).digest():
+        return False
     return True
 
 
@@ -58,7 +66,8 @@ def update_self(to_screen, verbose):
     try:
         newversion = compat_urllib_request.urlopen(VERSION_URL).read().decode('utf-8').strip()
     except:
-        if verbose: to_screen(compat_str(traceback.format_exc()))
+        if verbose:
+            to_screen(compat_str(traceback.format_exc()))
         to_screen(u'ERROR: can\'t find the current version. Please try again later.')
         return
     if newversion == __version__:
@@ -70,7 +79,8 @@ def update_self(to_screen, verbose):
         versions_info = compat_urllib_request.urlopen(JSON_URL).read().decode('utf-8')
         versions_info = json.loads(versions_info)
     except:
-        if verbose: to_screen(compat_str(traceback.format_exc()))
+        if verbose:
+            to_screen(compat_str(traceback.format_exc()))
         to_screen(u'ERROR: can\'t obtain versions info. Please try again later.')
         return
     if not 'signature' in versions_info:
@@ -118,7 +128,8 @@ def update_self(to_screen, verbose):
             newcontent = urlh.read()
             urlh.close()
         except (IOError, OSError):
-            if verbose: to_screen(compat_str(traceback.format_exc()))
+            if verbose:
+                to_screen(compat_str(traceback.format_exc()))
             to_screen(u'ERROR: unable to download latest version')
             return
 
@@ -131,7 +142,8 @@ def update_self(to_screen, verbose):
             with open(exe + '.new', 'wb') as outf:
                 outf.write(newcontent)
         except (IOError, OSError):
-            if verbose: to_screen(compat_str(traceback.format_exc()))
+            if verbose:
+                to_screen(compat_str(traceback.format_exc()))
             to_screen(u'ERROR: unable to write the new version')
             return
 
@@ -150,7 +162,8 @@ start /b "" cmd /c del "%%~f0"&exit /b"
             subprocess.Popen([bat])  # Continues to run in the background
             return  # Do not show premature success messages
         except (IOError, OSError):
-            if verbose: to_screen(compat_str(traceback.format_exc()))
+            if verbose:
+                to_screen(compat_str(traceback.format_exc()))
             to_screen(u'ERROR: unable to overwrite current version')
             return
 
@@ -161,7 +174,8 @@ start /b "" cmd /c del "%%~f0"&exit /b"
             newcontent = urlh.read()
             urlh.close()
         except (IOError, OSError):
-            if verbose: to_screen(compat_str(traceback.format_exc()))
+            if verbose:
+                to_screen(compat_str(traceback.format_exc()))
             to_screen(u'ERROR: unable to download latest version')
             return
 
@@ -174,19 +188,22 @@ start /b "" cmd /c del "%%~f0"&exit /b"
             with open(filename, 'wb') as outf:
                 outf.write(newcontent)
         except (IOError, OSError):
-            if verbose: to_screen(compat_str(traceback.format_exc()))
+            if verbose:
+                to_screen(compat_str(traceback.format_exc()))
             to_screen(u'ERROR: unable to overwrite current version')
             return
 
     to_screen(u'Updated youtube-dl. Restart youtube-dl to use the new version.')
 
+
 def get_notes(versions, fromVersion):
     notes = []
-    for v,vdata in sorted(versions.items()):
+    for v, vdata in sorted(versions.items()):
         if v > fromVersion:
             notes.extend(vdata.get('notes', []))
     return notes
 
+
 def print_notes(to_screen, versions, fromVersion=__version__):
     notes = get_notes(versions, fromVersion)
     if notes:
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index c3d8bf8e9..9ad0952d5 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -56,6 +56,7 @@ std_headers = {
     'Accept-Language': 'en-us,en;q=0.5',
 }
 
+
 def preferredencoding():
     """Get preferred encoding.
 
@@ -146,6 +147,8 @@ else:
 
 # On python2.6 the xml.etree.ElementTree.Element methods don't support
 # the namespace parameter
+
+
 def xpath_with_ns(path, ns_map):
     components = [c.split(':') for c in path.split('/')]
     replaced = []
@@ -256,6 +259,7 @@ def timeconvert(timestr):
         timestamp = email.utils.mktime_tz(timetuple)
     return timestamp
 
+
 def sanitize_filename(s, restricted=False, is_id=False):
     """Sanitizes a string so it could be used as part of a filename.
     If restricted is set, use a stricter subset of allowed characters.
@@ -288,6 +292,7 @@ def sanitize_filename(s, restricted=False, is_id=False):
             result = '_'
     return result
 
+
 def orderedSet(iterable):
     """ Remove all duplicates from the input iterable """
     res = []
@@ -372,6 +377,7 @@ def decodeOption(optval):
     assert isinstance(optval, compat_str)
     return optval
 
+
 def formatSeconds(secs):
     if secs > 3600:
         return '%d:%02d:%02d' % (secs // 3600, (secs % 3600) // 60, secs % 60)
@@ -424,6 +430,7 @@ def make_HTTPS_handler(opts_no_check_certificate, **kwargs):
 
 class ExtractorError(Exception):
     """Error during info extraction."""
+
     def __init__(self, msg, tb=None, expected=False, cause=None, video_id=None):
         """ tb, if given, is the original traceback (so that it can be printed out).
         If expected is set, this is a normal error message and most likely not a bug in youtube-dl.
@@ -468,6 +475,7 @@ class DownloadError(Exception):
     configured to continue on errors. They will contain the appropriate
     error message.
     """
+
     def __init__(self, msg, exc_info=None):
         """ exc_info, if given, is the original exception that caused the trouble (as returned by sys.exc_info()). """
         super(DownloadError, self).__init__(msg)
@@ -489,9 +497,11 @@ class PostProcessingError(Exception):
     This exception may be raised by PostProcessor's .run() method to
     indicate an error in the postprocessing task.
     """
+
     def __init__(self, msg):
         self.msg = msg
 
+
 class MaxDownloadsReached(Exception):
     """ --max-downloads limit has been reached. """
     pass
@@ -521,6 +531,7 @@ class ContentTooShortError(Exception):
         self.downloaded = downloaded
         self.expected = expected
 
+
 class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
     """Handler for HTTP requests and responses.
 
@@ -640,7 +651,7 @@ def unified_strdate(date_str):
         return None
 
     upload_date = None
-    #Replace commas
+    # Replace commas
     date_str = date_str.replace(',', ' ')
     # %z (UTC offset) is only supported in python>=3.2
     date_str = re.sub(r' ?(\+|-)[0-9]{2}:?[0-9]{2}$', '', date_str)
@@ -681,6 +692,7 @@ def unified_strdate(date_str):
             upload_date = datetime.datetime(*timetuple[:6]).strftime('%Y%m%d')
     return upload_date
 
+
 def determine_ext(url, default_ext='unknown_video'):
     if url is None:
         return default_ext
@@ -690,9 +702,11 @@ def determine_ext(url, default_ext='unknown_video'):
     else:
         return default_ext
 
+
 def subtitles_filename(filename, sub_lang, sub_format):
     return filename.rsplit('.', 1)[0] + '.' + sub_lang + '.' + sub_format
 
+
 def date_from_str(date_str):
     """
     Return a datetime object from a string in the format YYYYMMDD or
@@ -707,7 +721,7 @@ def date_from_str(date_str):
         if sign == '-':
             time = -time
         unit = match.group('unit')
-        #A bad aproximation?
+        # A bad aproximation?
         if unit == 'month':
             unit = 'day'
             time *= 30
@@ -718,7 +732,8 @@ def date_from_str(date_str):
         delta = datetime.timedelta(**{unit: time})
         return today + delta
     return datetime.datetime.strptime(date_str, "%Y%m%d").date()
-    
+
+
 def hyphenate_date(date_str):
     """
     Convert a date in 'YYYYMMDD' format to 'YYYY-MM-DD' format"""
@@ -728,8 +743,10 @@ def hyphenate_date(date_str):
     else:
         return date_str
 
+
 class DateRange(object):
     """Represents a time interval between two dates"""
+
     def __init__(self, start=None, end=None):
         """start and end must be strings in the format accepted by date"""
         if start is not None:
@@ -742,17 +759,20 @@ class DateRange(object):
             self.end = datetime.datetime.max.date()
         if self.start > self.end:
             raise ValueError('Date range: "%s" , the start date must be before the end date' % self)
+
     @classmethod
     def day(cls, day):
         """Returns a range that only contains the given day"""
-        return cls(day,day)
+        return cls(day, day)
+
     def __contains__(self, date):
         """Check if the date is in the range"""
         if not isinstance(date, datetime.date):
             date = date_from_str(date)
         return self.start <= date <= self.end
+
     def __str__(self):
-        return '%s - %s' % ( self.start.isoformat(), self.end.isoformat())
+        return '%s - %s' % (self.start.isoformat(), self.end.isoformat())
 
 
 def platform_name():
@@ -1150,7 +1170,7 @@ def parse_duration(s):
 
 
 def prepend_extension(filename, ext):
-    name, real_ext = os.path.splitext(filename) 
+    name, real_ext = os.path.splitext(filename)
     return '{0}.{1}{2}'.format(name, ext, real_ext)