Windows 系统 使用 VC2019 编写 python 的 C++ 拓展

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// MyMath.cpp
#include "pch.h"
#include "Python.h"

double Add(double x, double y)
{
	return x + y;
}
double Subtract(double x, double y)
{
	return x - y;
}

double Multiply(double x, double y)
{
	return x * y;
}

double Divide(double x, double y)
{
	return x / y;
}

// 封装c++函数
PyObject* MyMath_Add(PyObject* self, PyObject* args)
{
	double x, y;
	if (!PyArg_ParseTuple(args, "dd", &x, &y))
	{
		return NULL;
	}

	return Py_BuildValue("d", Add(x, y));
}
PyObject* MyMath_Subtract(PyObject* self, PyObject* args)
{
	double x, y;
	if (!PyArg_ParseTuple(args, "dd", &x, &y))
	{
		return NULL;
	}
	return Py_BuildValue("d", Subtract(x, y));
}
PyObject* MyMath_Multiply(PyObject* self, PyObject* args)
{
	double x, y;
	if (!PyArg_ParseTuple(args, "dd", &x, &y))
	{
		return NULL;
	}
	return Py_BuildValue("d", Multiply(x, y));
}
PyObject* MyMath_Divide(PyObject* self, PyObject* args)
{
	double x, y;
	if (!PyArg_ParseTuple(args, "dd", &x, &y))
	{
		return NULL;
	}
	return Py_BuildValue("d", Divide(x, y));
}

static PyMethodDef MyMath_methods[] = {
	{"add", MyMath_Add, METH_VARARGS, "This is an add function."},
	{"subtract", MyMath_Subtract, METH_VARARGS, "This is a subtract function."},
	{"multiply", MyMath_Multiply, METH_VARARGS, "This is a multiply function."},
	{"divide", MyMath_Divide, METH_VARARGS, "This is a divide function."},
	{NULL, NULL, 0, NULL}
};

static PyModuleDef MyMath_module = {
	PyModuleDef_HEAD_INIT,
	"MyMath",
	"My Math Module",
	0,
	MyMath_methods
};

PyMODINIT_FUNC PyInit_MyMath()
{
	return PyModule_Create(&MyMath_module);
}

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## main.py
import MyMath

print(MyMath.add(1.5, 3.))
print(MyMath.subtract(1.5, 3.))
print(MyMath.multiply(1.5, 3.))
print(MyMath.divide(1.5, 3.))

print(type(MyMath.add(1.5, 3.)))