python怎么在c中运行程序

#!/usr/bin/env python

# test.py

import sys

x = int(sys.argv[1])

print x*x

/* test.c */

#include <stdio.h>

#include <stdlib.h>

int main()

{

        FILE *f;

        char s[1024];

        int ret;

        f = popen("./test.py 99", "r");

        while((ret=fread(s,1,1024,f))>0) {

                fwrite(s,1,ret,stdout);

        }

        fclose(f);

        return 0;

}

$ gcc test.c

$ ./a.out

9801