C++调用Python-2：调用Python函数，返回数字

# mytest.py

def hello():
    print("this is test python print hello world")
    return 123

#include "Python.h"
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    Py_Initialize();
    if (!Py_IsInitialized())
    {
        cout << "初始化失败" << endl;
    }

    PyRun_SimpleString("import sys");
    PyRun_SimpleString("sys.path.append('./')");

    PyObject* pModel = nullptr;
    pModel = PyImport_ImportModule("mytest");

    // hello 函数
    PyObject* helloFunc = PyObject_GetAttrString(pModel, "hello");
    PyObject* helloArgs = NULL;
    PyObject* helloRes = PyObject_CallObject(helloFunc, helloArgs);
    int pythonHelloRes = PyFloat_AsDouble(helloRes);
    cout << "返回值：" << pythonHelloRes << endl;
    Py_DecRef(helloRes);
    Py_DecRef(helloArgs);
    Py_DecRef(helloFunc);

    Py_Finalize();
    return 0;
}