added prefix_number option to the tests

pytube/contrib/playlist.py

@@ -66,7 +66,7 @@ class Playlist(object):
             complete_url = base_url + video_id
             self.video_urls.append(complete_url)
 
-    def download_all(self, download_path=None, file_number_prefix=True):
+    def download_all(self, download_path=None, prefix_number=True):
         """Download all the videos in the the playlist. Initially, download
         resolution is 720p (or highest available), later more option
         should be added to download resolution of choice
@@ -90,7 +90,7 @@ class Playlist(object):
             while True:
                 prefix = str(i)
                 if len(prefix) < digits:
-                    for f in range(digits - len(prefix)):
+                    for _ in range(digits - len(prefix)):
                         prefix = "0" + prefix
                 prefix += " "
                 i += 1

tests/test_playlist.py

@@ -50,3 +50,5 @@ def test_download():
     )
     ob.download_all()
     ob.download_all('.')
+    ob.download_all(prefix_number=False)
+    ob.download_all('.', prefix_number=False)