Remove unusued imports

youtube_dl/extractor/appletrailers.py

@@ -6,7 +6,6 @@ import json
 from .common import InfoExtractor
 from ..utils import (
     compat_urlparse,
-    determine_ext,
 )
 
 

youtube_dl/extractor/youtube.py

@@ -7,7 +7,6 @@ import itertools
 import json
 import os.path
 import re
-import string
 import struct
 import traceback
 import zlib