BUG - Allow a mapper of type collections.abc.Mapping when using

Series.map

Author: ohad83

pandas/core/base.py

@@ -2,6 +2,7 @@
 Base and utility classes for pandas objects.
 """
 import builtins
+from collections import OrderedDict, abc
 import textwrap
 from typing import Dict, FrozenSet, List, Optional
 
@@ -1107,7 +1108,7 @@ def _map_values(self, mapper, na_action=None):
  # we can fastpath dict/Series to an efficient map
  # as we know that we are not going to have to yield
  # python types
- if isinstance(mapper, dict):
+ if isinstance(mapper, abc.Mapping):
  if hasattr(mapper, "__missing__"):
  # If a dictionary subclass defines a default value method,
  # convert mapper to a lookup function (GH #15999).