[dropbox] PEP8 and simplify (#2171)

youtube_dl/extractor/dropbox.py

@@ -5,28 +5,26 @@ import re
 
 from .common import InfoExtractor
 
+
 class DropboxIE(InfoExtractor):
     _VALID_URL = r'https?://(?:www\.)?dropbox[.]com/s/(?P<id>[a-zA-Z0-9]{15})/(?P<title>[^?#]*)'
     _TEST = {
-        u'url': u'https://www.dropbox.com/s/mcnzehi9wo55th4/20131219_085616.mp4',
-        u'file': u'mcnzehi9wo55th4.mp4',
-        u'md5': u'2cec58eb277054eca0dbaaf3bdc72564',
-        u'info_dict': {
-            u'title': '20131219_085616'
+        'url': 'https://www.dropbox.com/s/mcnzehi9wo55th4/20131219_085616.mp4',
+        'file': 'mcnzehi9wo55th4.mp4',
+        'md5': '2cec58eb277054eca0dbaaf3bdc72564',
+        'info_dict': {
+            'title': '20131219_085616'
         }
     }
 
-    
-    def _real_extract(self,url):
+    def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
-        video_id=mobj.group('id')
-        title=mobj.group('title')
-        webpage = self._download_webpage(url, video_id)
-        video_url=url+'?dl=1'
-        return{
-               'id':video_id,
-               'title':title,
-               'url':video_url
-               
-               }
+        video_id = mobj.group('id')
+        title = mobj.group('title')
+        video_url = url + '?dl=1'
 
+        return {
+            'id': video_id,
+            'title': title,
+            'url': video_url,
+        }