Segmentation fault occurs when PyRun_SimpleFile is called repeatedly - c++

Question

I want to embed a python code written in version 3.5 in c++. Also, the python script needs to be executed as the whole script repeatedly. My code as follows. It executes well for the first iteration and gives a segmentation fault at the second iteration.
main.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;
}
example.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()
I build the project using:
cmake --build . --target Demo -- -j 2
and executed as:
./Demo --learning_rate 0.02
The output was:
start
0.02
Done
start
Segmentation fault (core dumped)
Then I replaced the content of "example.py" as:
print("Hi")
The output was:
start
Hi
Done
start
Hi
Done
start
Hi
Done
How can I fix the above mentioned segmentation fault ?

Answer 1

See the 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.