Make defaults of Cassette constructor immutable. Clean up whitespace. Remove unused import.

vcr/cassette.py

@@ -30,12 +30,12 @@ class Cassette(ContextDecorator):
                  path,
                  serializer=yamlserializer,
                  record_mode='once',
-                 match_on=[uri, method],
-                 filter_headers=[],
-                 filter_query_parameters=[],
+                 match_on=(uri, method),
+                 filter_headers=(),
+                 filter_query_parameters=(),
                  before_record=None,
-                 ignore_hosts=[],
-                 ignore_localhost=[],
+                 ignore_hosts=(),
+                 ignore_localhost=()
                  ):
         self._path = path
         self._serializer = serializer

vcr/compat/counter.py

@@ -26,7 +26,7 @@ class Counter(dict):
         >>> c = Counter({'a': 4, 'b': 2})           # a new counter from a mapping
         >>> c = Counter(a=4, b=2)                   # a new counter from keyword args
 
-        '''        
+        '''
         self.update(iterable, **kwds)
 
     def __missing__(self, key):
@@ -39,7 +39,7 @@ class Counter(dict):
         >>> Counter('abracadabra').most_common(3)
         [('a', 5), ('r', 2), ('b', 2)]
 
-        '''        
+        '''
         if n is None:
             return sorted(self.iteritems(), key=itemgetter(1), reverse=True)
         return nlargest(n, self.iteritems(), key=itemgetter(1))
@@ -78,7 +78,7 @@ class Counter(dict):
         >>> c['h']                      # four 'h' in which, witch, and watch
         4
 
-        '''        
+        '''
         if iterable is not None:
             if hasattr(iterable, 'iteritems'):
                 if self:

vcr/persisters/filesystem.py

@@ -1,4 +1,3 @@
-import tempfile
 import os