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title: Serialization Hooks sidebar_position: 10 id: serialization-hooks license: | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Python native mode honors Python object customization protocols while writing Fory native bytes. It does not emit Pickle wire data. Use this page when replacing pickle or cloudpickle or when a class controls its reduction, construction, or state restoration.

Pickle And Cloudpickle Replacement

Native mode is the Python mode to choose when the existing boundary uses pickle or cloudpickle. It supports richer Python values than JSON and xlang mode, including Python functions, local classes, closures, and reduction hooks.

Use xlang mode instead when the payload crosses language boundaries or the data model should be a portable schema shared with other Fory implementations.

Custom Python Object Hooks

Native mode respects common Python customization hooks:

import pyfory

class SessionToken:
    def __init__(self, value):
        self.value = value

    def __getstate__(self):
        return {"value": self.value}

    def __setstate__(self, state):
        self.value = state["value"]

fory = pyfory.Fory(xlang=False, strict=False)
token = fory.loads(fory.dumps(SessionToken("abc")))
print(token.value)  # abc

Use these hooks for Python-only payloads. For xlang payloads, model the data as dataclasses with portable field annotations instead.

Protocol 5 buffers

Reduction hooks can expose Pickle protocol 5 buffers. The transport and buffer callback procedure is documented in Out-of-Band Buffers.