code: def map_dict(key_map, *dicts, copy=False, base=None):
      
  
      it = combine_dicts(*dicts).items()  # Combine dicts.
  
      get = key_map.get  # Namespace shortcut.
  
      # Return mapped dict.
      return combine_dicts({get(k, k): v for k, v in it}, copy=copy, base=base)
docs: Returns a dict with new key values.
  
      :param key_map:
          A dictionary that maps the dict keys ({old key: new key}
      :type key_map: dict
  
      :param dicts:
          A sequence of dicts.
      :type dicts: dict
  
      :param copy:
          If True, it returns a deepcopy of input values.
      :type copy: bool, optional
  
      :param base:
          Base dict where combine multiple dicts in one.
      :type base: dict, optional
  
      :return:
          A unique dict with new key values.
      :rtype: dict
  
      Example::
  
          >>> d = map_dict({'a': 'c', 'b': 'd'}, {'a': 1, 'b': 1}, {'b': 2})
          >>> sorted(d.items())
          [('c', 1), ('d', 2)]