Lower case Json decoder in Python3

lower_case_json.py

class LowerCaseJSONDecoder(JSONDecoder):

    def _lower_keys(self, obj):
        new = {}
        for k, v in obj.items():
            if isinstance(v, dict):
                v = self._lower_keys(v)
            new[k.lower()] = v
        return new

    def decode(self, *args, **kwargs):
        obj = super().decode(*args, **kwargs)
        return self._lower_keys(obj)

Usage:

>>> import json
>>> txt = '{"SerialNumber": 45, "Name": "Super"}'
>>> payload = json.loads(txt, cls=LowerCaseJSONDecoder)
>>> payload
{'serialnumber': 45, 'name': 'Super'}
``