什么是PyClass_New相当于在Python 3？ [英] What is the PyClass_New equivalent in Python 3?

问题描述

previously我已经用C API一些Python类。当我要建立旧项目与Python 3+它提供了以下编译错误

PyClass_New没有在这个范围内声明
Py_InitModule没有在这个范围内声明

什么是等价？

 的PyObject * pClassDic = PyDict_New（）;
*的PyObject = pClassName PyBytes_FromString（MyClass的）;
*的PyObject = pClass PyClass_New（NULL，pClassDic，pClassName）;
 

解决方案

如果你不想去通过设置你的对象和类型结构的麻烦，你应该能够通过调用创建一个新的类Python的类型（名称，碱，字典）从C：

 的PyObject * pClassName = PyBytes_FromString（MyClass的）;
的PyObject * pClassBases = PyTuple_New（0）; //为基地的一个空的元组等同于`（对象）`
的PyObject * pClassDic = PyDict_New（）;// pClass =类型（pClassName，pClassBases，pClassDic）
的PyObject * pClass = PyObject_CallFunctionObjArgs（PyType_Type，pClassName，pClassBases，pClassDic，NULL）;Py_CLEAR（pClassName）;
Py_CLEAR（pClassBases）;
Py_CLEAR（pClassDic）;
 

Previously I have created some Python classes using C API. When I'm going to build the old project with Python 3+ it gives following compile error

PyClass_New was not declared in this scope
Py_InitModule was not declared in this scope

What are the equivalents?

PyObject *pClassDic = PyDict_New();
PyObject *pClassName = PyBytes_FromString("MyClass");
PyObject *pClass = PyClass_New(NULL, pClassDic, pClassName);

解决方案

If you don't want to go through the hassle of setting up your object and type structs, you should be able to create a new class by calling Python's type(name, bases, dict) from C:

PyObject *pClassName = PyBytes_FromString("MyClass");
PyObject *pClassBases = PyTuple_New(0); // An empty tuple for bases is equivalent to `(object,)`
PyObject *pClassDic = PyDict_New();

// pClass = type(pClassName, pClassBases, pClassDic)
PyObject *pClass = PyObject_CallFunctionObjArgs(PyType_Type, pClassName, pClassBases, pClassDic, NULL);

Py_CLEAR(pClassName);
Py_CLEAR(pClassBases);
Py_CLEAR(pClassDic);

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