C++调用Python3：调用Python函数，返回字符串

# mytest.py
def hello1():
    print("this is test python print hello world 1")
    return "456"

#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");

    // hello1 函数
    PyObject* hello1Func = PyObject_GetAttrString(pModel, "hello1");
    PyObject* hello1Args = nullptr;
    PyObject* hello1Res = PyObject_CallObject(hello1Func, hello1Args);
    char* getHello1Res = nullptr;
    PyArg_Parse(hello1Res, "s", &getHello1Res);
    cout << "返回值：" << getHello1Res << endl;
    Py_DecRef(hello1Res);
    Py_DecRef(hello1Args);
    Py_DecRef(hello1Func);

    Py_Finalize();
    return 0;
}