- def _extract_signature_function(self, video_id, player_url, slen):
+ def _signature_cache_id(self, example_sig):
+ """ Return a string representation of a signature """
+ return u'.'.join(compat_str(len(part)) for part in example_sig.split('.'))
+
+ def _extract_signature_function(self, video_id, player_url, example_sig):