c++ - 重复调用PyRun_SimpleFile出现Segmentation fault

Question

我想在 c++ 中嵌入一个用 3.5 版编写的 python 代码。此外，python 脚本需要作为整个脚本重复执行。我的代码如下。它在第一次迭代时执行良好，在第二次迭代时给出段错误。

主要.cpp:

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

int main(int argc, char *argv[])
{
    int i = 0;
    while(i<3){
    cout<<"start"<<endl;
    Py_Initialize();
    FILE* file;
    wchar_t* _argv[argc];
    for(int i=0; i<argc; i++){
        wchar_t *arg = Py_DecodeLocale(argv[i], NULL);
        _argv[i] = arg;
    }

    PySys_SetArgv(argc, _argv);
    PyObject *sys = PyImport_ImportModule("sys");
    PyObject *path = PyObject_GetAttrString(sys, "path");

    PyList_Append(path, PyUnicode_FromString("."));
    file = fopen("./example.py","r");
    PyRun_SimpleFile(file, "./example.py");
    fclose(file);
    Py_Finalize();
    cout<<"Done"<<endl;
    i++;
    }
    return 0;
}

例子.py:

import tensorflow as tf

flags = tf.app.flags
FLAGS = flags.FLAGS

flags.DEFINE_float('learning_rate', 0.01, 'initial learning rate')

def main(argv=None):
    print(FLAGS.learning_rate)

if __name__ == '__main__':
    main()

我使用以下方法构建项目:cmake --build 。 --目标演示 -- -j 2并执行为:./Demo --learning_rate 0.02

输出是:

start
0.02
Done
start
Segmentation fault (core dumped)

然后我将“example.py”的内容替换为:print("嗨")

输出是:

start
Hi
Done
start
Hi
Done
start
Hi
Done

如何修复上述段错误？

Answer 1

参见 docs

Some extensions may not work properly if their initialization routine is called more than once; this can happen if an application calls Py_Initialize() and Py_Finalize() more than once.