models.py 文件源码

def to_python(self, value):
        """Overrides ``models.Field`` method. This is used to convert
        bytes (from serialization etc) to an instance of this class"""
        if value is None:
            return None
        elif isinstance(value, oauth2client.client.Credentials):
            return value
        else:
            try:
                return jsonpickle.decode(
                    base64.b64decode(encoding.smart_bytes(value)).decode())
            except ValueError:
                return pickle.loads(
                    base64.b64decode(encoding.smart_bytes(value)))