docs: def from_dicts_by_key(cls, ds: dict,
                            force_snake_case: bool=True, force_cast: bool=False, restrict: bool=True) -> TDict[T]:
          """From dict of dict to dict of instance
  
          :param ds: Dict of dict
          :param force_snake_case: Keys are transformed to snake case in order to compliant PEP8 if True
          :param force_cast: Cast forcibly if True
          :param restrict: Prohibit extra parameters if True
          :return: Dict of instance
  
          Usage:
  
              >>> from owlmixin.samples import Human
              >>> humans_by_name: TDict[Human] = Human.from_dicts_by_key({
              ...    'Tom':  {"id": 1, "name": "Tom",  "favorites": [{"name": "Apple"}]},
              ...    'John': {"id": 2, "name": "John", "favorites": [{"name": "Orange"}]}
              ... })
              >>> humans_by_name['Tom'].name
              'Tom'
              >>> humans_by_name['John'].name
              'John'
          """
          return TDict({k: cls.from_dict(v,
                                         force_snake_case=force_snake_case,
                                         force_cast=force_cast,
                                         restrict=restrict) for k, v in ds.items()})