Flatten a dict

        :param dicts: Flatten a dict
        :type dicts: list(dict)

def _flatten_dicts(self, dicts):
        """Flatten a dict

        :param dicts: Flatten a dict
        :type dicts: list(dict)
        """
        d = dict()
        list_of_dicts = [d.get() for d in dicts or []]
        return {k: v for d in list_of_dicts for k, v in d.items()}