diff --git a/youtube_dl/extractor/smotri.py b/youtube_dl/extractor/smotri.py
index f035a3214c..5a28bc8208 100644
--- a/youtube_dl/extractor/smotri.py
+++ b/youtube_dl/extractor/smotri.py
@@ -6,7 +6,6 @@
 
 from .common import InfoExtractor
 from ..utils import (
-    determine_ext,
     ExtractorError
 )
 
diff --git a/youtube_dl/extractor/theplatform.py b/youtube_dl/extractor/theplatform.py
index 9206895116..61452e47d7 100644
--- a/youtube_dl/extractor/theplatform.py
+++ b/youtube_dl/extractor/theplatform.py
@@ -4,7 +4,6 @@
 from .common import InfoExtractor
 from ..utils import (
     xpath_with_ns,
-    find_xpath_attr,
 )
 
 _x = lambda p: xpath_with_ns(p, {'smil': 'http://www.w3.org/2005/SMIL21/Language'})
diff --git a/youtube_dl/extractor/viddler.py b/youtube_dl/extractor/viddler.py
index 138a35b2a0..9328ef4a21 100644
--- a/youtube_dl/extractor/viddler.py
+++ b/youtube_dl/extractor/viddler.py
@@ -2,9 +2,6 @@
 import re
 
 from .common import InfoExtractor
-from ..utils import (
-    determine_ext,
-)
 
 
 class ViddlerIE(InfoExtractor):
diff --git a/youtube_dl/extractor/yahoo.py b/youtube_dl/extractor/yahoo.py
index e457c4707a..5c9c361b9e 100644
--- a/youtube_dl/extractor/yahoo.py
+++ b/youtube_dl/extractor/yahoo.py
@@ -47,7 +47,7 @@ def _real_extract(self, url):
         # The 'meta' field is not always in the video webpage, we request it
         # from another page
         long_id = info['id']
-        return self._get_info(info['id'], video_id)
+        return self._get_info(long_id, video_id)
 
     def _get_info(self, long_id, video_id):
         query = ('SELECT * FROM yahoo.media.video.streams WHERE id="%s"'
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index c486ef8ecf..77609f7ca6 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -17,7 +17,6 @@
 import socket
 import sys
 import traceback
-import xml.etree.ElementTree
 import zlib
 
 try: