diff --git a/youtube_dl/extractor/collegehumor.py b/youtube_dl/extractor/collegehumor.py
index 8d4c93d6da..0c29acfb13 100644
--- a/youtube_dl/extractor/collegehumor.py
+++ b/youtube_dl/extractor/collegehumor.py
@@ -71,10 +71,8 @@ def _real_extract(self, url):
 
             adoc = xml.etree.ElementTree.fromstring(manifestXml)
             try:
-                media_node = adoc.findall('./{http://ns.adobe.com/f4m/1.0}media')[0]
-                node_id = media_node.attrib['url']
                 video_id = adoc.findall('./{http://ns.adobe.com/f4m/1.0}id')[0].text
-            except IndexError as err:
+            except IndexError:
                 raise ExtractorError(u'Invalid manifest file')
             url_pr = compat_urllib_parse_urlparse(info['thumbnail'])
             info['url'] = url_pr.scheme + '://' + url_pr.netloc + video_id[:-2].replace('.csmil','').replace(',','')
diff --git a/youtube_dl/extractor/eighttracks.py b/youtube_dl/extractor/eighttracks.py
index 2cfbcd363c..f21ef88530 100644
--- a/youtube_dl/extractor/eighttracks.py
+++ b/youtube_dl/extractor/eighttracks.py
@@ -1,4 +1,3 @@
-import itertools
 import json
 import random
 import re
diff --git a/youtube_dl/extractor/facebook.py b/youtube_dl/extractor/facebook.py
index f8bdfc2d33..3b210710e3 100644
--- a/youtube_dl/extractor/facebook.py
+++ b/youtube_dl/extractor/facebook.py
@@ -1,5 +1,4 @@
 import json
-import netrc
 import re
 import socket
 
diff --git a/youtube_dl/extractor/fktv.py b/youtube_dl/extractor/fktv.py
index 9c89362efa..dba1a8dc26 100644
--- a/youtube_dl/extractor/fktv.py
+++ b/youtube_dl/extractor/fktv.py
@@ -39,7 +39,6 @@ def _real_extract(self, url):
         for i, _ in enumerate(files, 1):
             video_id = '%04d%d' % (episode, i)
             video_url = 'http://dl%d.fernsehkritik.tv/fernsehkritik%d%s.flv' % (server, episode, '' if i == 1 else '-%d' % i)
-            video_title = 'Fernsehkritik %d.%d' % (episode, i)
             videos.append({
                 'id': video_id,
                 'url': video_url,
diff --git a/youtube_dl/extractor/gamespot.py b/youtube_dl/extractor/gamespot.py
index 098768361e..9645b00c33 100644
--- a/youtube_dl/extractor/gamespot.py
+++ b/youtube_dl/extractor/gamespot.py
@@ -24,7 +24,7 @@ class GameSpotIE(InfoExtractor):
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
-        page_id = video_id = mobj.group('page_id')
+        page_id = mobj.group('page_id')
         webpage = self._download_webpage(url, page_id)
         data_video_json = self._search_regex(r'data-video=\'(.*?)\'', webpage, u'data video')
         data_video = json.loads(unescapeHTML(data_video_json))
diff --git a/youtube_dl/extractor/jeuxvideo.py b/youtube_dl/extractor/jeuxvideo.py
index 6bb54b9322..0020c47cfd 100644
--- a/youtube_dl/extractor/jeuxvideo.py
+++ b/youtube_dl/extractor/jeuxvideo.py
@@ -22,7 +22,7 @@ class JeuxVideoIE(InfoExtractor):
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
-        title = re.match(self._VALID_URL, url).group(1)
+        title = mobj.group(1)
         webpage = self._download_webpage(url, title)
         xml_link = self._html_search_regex(
             r'<param name="flashvars" value="config=(.*?)" />',
diff --git a/youtube_dl/extractor/livestream.py b/youtube_dl/extractor/livestream.py
index 1a3e0ae6b9..5f548437cd 100644
--- a/youtube_dl/extractor/livestream.py
+++ b/youtube_dl/extractor/livestream.py
@@ -6,9 +6,7 @@
 from ..utils import (
     compat_urllib_parse_urlparse,
     compat_urlparse,
-    get_meta_content,
     xpath_with_ns,
-    ExtractorError,
 )
 
 
diff --git a/youtube_dl/extractor/mtv.py b/youtube_dl/extractor/mtv.py
index 3df7f9b85a..04afd6c4c8 100644
--- a/youtube_dl/extractor/mtv.py
+++ b/youtube_dl/extractor/mtv.py
@@ -59,7 +59,6 @@ def _extract_video_formats(self, metadataXml):
         if '/error_country_block.swf' in metadataXml:
             raise ExtractorError(u'This video is not available from your country.', expected=True)
         mdoc = xml.etree.ElementTree.fromstring(metadataXml.encode('utf-8'))
-        renditions = mdoc.findall('.//rendition')
 
         formats = []
         for rendition in mdoc.findall('.//rendition'):
diff --git a/youtube_dl/extractor/pornhub.py b/youtube_dl/extractor/pornhub.py
index 75cf4bb9f6..8b34719195 100644
--- a/youtube_dl/extractor/pornhub.py
+++ b/youtube_dl/extractor/pornhub.py
@@ -6,7 +6,6 @@
     compat_urllib_parse_urlparse,
     compat_urllib_request,
     compat_urllib_parse,
-    unescapeHTML,
 )
 from ..aes import (
     aes_decrypt_text
diff --git a/youtube_dl/extractor/soundcloud.py b/youtube_dl/extractor/soundcloud.py
index 83e1f055f8..687457e103 100644
--- a/youtube_dl/extractor/soundcloud.py
+++ b/youtube_dl/extractor/soundcloud.py
@@ -158,7 +158,6 @@ def _real_extract(self, url):
         resolv_url = self._resolv_url(url)
         info_json = self._download_webpage(resolv_url, full_title)
 
-        videos = []
         info = json.loads(info_json)
         if 'errors' in info:
             for err in info['errors']:
diff --git a/youtube_dl/extractor/spankwire.py b/youtube_dl/extractor/spankwire.py
index 97f9c268a4..794550c81e 100644
--- a/youtube_dl/extractor/spankwire.py
+++ b/youtube_dl/extractor/spankwire.py
@@ -6,7 +6,6 @@
     compat_urllib_parse_urlparse,
     compat_urllib_request,
     compat_urllib_parse,
-    unescapeHTML,
 )
 from ..aes import (
     aes_decrypt_text
diff --git a/youtube_dl/extractor/spiegel.py b/youtube_dl/extractor/spiegel.py
index 6dc2eda6d9..19ce585cf1 100644
--- a/youtube_dl/extractor/spiegel.py
+++ b/youtube_dl/extractor/spiegel.py
@@ -2,7 +2,6 @@
 import xml.etree.ElementTree
 
 from .common import InfoExtractor
-from ..utils import determine_ext
 
 
 class SpiegelIE(InfoExtractor):
diff --git a/youtube_dl/extractor/ted.py b/youtube_dl/extractor/ted.py
index 2e497c86ee..4bca62ba00 100644
--- a/youtube_dl/extractor/ted.py
+++ b/youtube_dl/extractor/ted.py
@@ -4,7 +4,6 @@
 from .subtitles import SubtitlesInfoExtractor
 
 from ..utils import (
-    compat_str,
     RegexNotFoundError,
 )
 
@@ -113,6 +112,6 @@ def _get_available_subtitles(self, video_id, webpage):
                     url = 'http://www.ted.com/talks/subtitles/id/%s/lang/%s/format/srt' % (video_id, l)
                     sub_lang_list[l] = url
                 return sub_lang_list
-        except RegexNotFoundError as err:
+        except RegexNotFoundError:
             self._downloader.report_warning(u'video doesn\'t have subtitles')
         return {}
diff --git a/youtube_dl/extractor/tube8.py b/youtube_dl/extractor/tube8.py
index d4b7603c7c..4d9d41db3a 100644
--- a/youtube_dl/extractor/tube8.py
+++ b/youtube_dl/extractor/tube8.py
@@ -5,8 +5,6 @@
 from ..utils import (
     compat_urllib_parse_urlparse,
     compat_urllib_request,
-    compat_urllib_parse,
-    unescapeHTML,
 )
 from ..aes import (
     aes_decrypt_text
diff --git a/youtube_dl/extractor/xtube.py b/youtube_dl/extractor/xtube.py
index 03ad88bede..e3458d2bd4 100644
--- a/youtube_dl/extractor/xtube.py
+++ b/youtube_dl/extractor/xtube.py
@@ -5,7 +5,6 @@
 from ..utils import (
     compat_urllib_parse_urlparse,
     compat_urllib_request,
-    compat_urllib_parse,
 )
 
 class XTubeIE(InfoExtractor):
diff --git a/youtube_dl/extractor/zdf.py b/youtube_dl/extractor/zdf.py
index faed7ff7f0..c6a9d06f2c 100644
--- a/youtube_dl/extractor/zdf.py
+++ b/youtube_dl/extractor/zdf.py
@@ -53,7 +53,7 @@ def stream_pref(s):
             video_id,
             u'Get stream URL')
 
-        MMS_STREAM = r'href="(?P<video_url>mms://[^"]*)"'
+        #MMS_STREAM = r'href="(?P<video_url>mms://[^"]*)"'
         RTSP_STREAM = r'(?P<video_url>rtsp://[^"]*.mp4)'
 
         mobj = re.search(self._MEDIA_STREAM, media_link)