def _deserialize(self, value, attr, data):
        if self.deserialize_method_name:
            try:
                method = utils.callable_or_raise(
                    getattr(self.parent, self.deserialize_method_name, None)
                )
                return method(value)
            except __HOLE__:
                pass
        return value
dataset/ETHPy150Open marshmallow-code/marshmallow/marshmallow/fields.py/Method._deserialize