[pratice] Python3.5 call C++ function with extern "C"

hello.cpp

#include "hello.h"
#include<Python.h>

using namespace std;

extern "C"{
  static PyObject *_hello(PyObject *self, PyObject *args){
    hello();
    return self;
  }
  static PyMethodDef HelloMethods[] = {
    {"hello", _hello, METH_VARARGS,""},
    {NULL, NULL, 0, NULL}
  };
  static struct PyModuleDef hellomodule = {
    PyModuleDef_HEAD_INIT,
    "hello",   /* name of module */
    NULL, /* module documentation, may be NULL */
    -1,       /* size of per-interpreter state of the module,
                 or -1 if the module keeps state in global variables. */
    HelloMethods
  };
  PyMODINIT_FUNC PyInit_hello(void){
    return PyModule_Create(&hellomodule);
  }
}

void hello(){
  cout<<"Hello"<<endl;
  return ;
}

hello.h

#include<Python.h>
#include<iostream>
#include<cstdlib>

void hello();

hello.py

import hello
hello.hello()

print("END")

main.c

#include<iostream>
#include<cstdlib>
#include "./hello.h"

using namespace std;

int main(){
  hello();
}

makefile

CPP = c++
C = gcc
DELETE = rm -f

all:
	${CPP} -fPIC -shared hello.cpp -o hello.so -I/usr/include/python3.5/ -L/usr/lib/python3.5/config-3.5m-x86_64-linux-gnu/ -lpython3.5

exec_hello:
	${CPP} main.cpp hello.cpp -o hello -I/usr/include/python3.5/ -L/usr/lib/python3.5/config-3.5m-x86_64-linux-gnu/ -lpython3.5

clean:
	${DELETE} hello hello.so

use make to build hello.so, then exec python3 hello.py

or use make exec_hello to build exec file, it test c++ code is right.

finally, use make clean to delete .so file and exec file.