python:腌制c对象 [英] python: pickling c objects

问题描述

首先，我不希望有解决方案，只是希望获得一些有关如何开始的指导.

First off I'm not expecting a solution, just hoping for some pointers on how to start.

我有一个带有嵌入式Python解释器的C程序.程序用作输入的Python脚本显然引用了C定义的对象和函数.我现在想使其中一些对象可腌制.

I've got a C program with an embedded Python interpreter. The Python scripts the program uses as input obviously refer to the C-defined objects and functions. I'd now like to make some of these objects pickleable.

泡菜文档描述了如何使用__reduce__使扩展类型可泡菜.但这是一个Python方法-如何在底层PyObject中定义它?

The pickle docs describe how extension types can be made picklable using __reduce__. But this is a Python method - how would I define this in the underlying PyObject?

完全确定我误会了一些东西...

Fairly sure I'm mis-understanding something...

推荐答案

pickle模块既有纯Python版本又有C变体(称为cPickle).因此，__reduce__方法需要可以从Python代码中调用.

The pickle module comes in both a python-only and a C variant (called cPickle). As such, the __reduce__ method needs to be callable from Python code.

因此，您需要在C对象中提供__reduce__条目 PyMethodDef struct 以及合适的实现.

Thus, you need to provide a __reduce__ entry in your C object PyMethodDef struct with a suitable implementation.

或者，您也可以在 copy_reg模块中注册一个酸洗功能.该模块的原始用例是更好地支持扩展模块.模块状态的源代码:

Alternatively, you can also register a pickling function with the copy_reg module. This module's original usecase was to support extension modules better; the source code for the module states:

这仅对添加C语言中定义的扩展类型的pickle支持有用，不适用于用户定义类的实例.

This is only useful to add pickle support for extension types defined in C, not for instances of user-defined classes.

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