support python2 as well

alchemy_mock/comparison.py

@@ -1,8 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import, print_function, unicode_literals
-import collections.abc
-
 import six
+from six.moves.collections_abc import Mapping
 from sqlalchemy import func
 from sqlalchemy.sql.expression import column, or_
 
@@ -147,7 +146,7 @@ def _(v):
                     for i, j in six.moves.zip_longest(self.expr, other)
                 )
 
-            elif isinstance(self.expr, collections.abc.Mapping):
+            elif isinstance(self.expr, Mapping):
                 same_keys = self.expr.keys() == other.keys()
                 return same_keys and all(
                     _(self.expr[k]) == other[k] for k in self.expr.keys()