gistfile1.c

import ctypes
import os
import sys

here = os.path.dirname(__file__)
cpath = os.path.abspath(os.path.join(here, "fib.so"))
fiblib = ctypes.CDLL(cpath)

def fib(n):
    if n == 0:
        return 0
    elif n == 1:
        return 1
    else:
        return fib(n-1) + fib(n-2)

if __name__ == '__main__':
    func = None

    if len(sys.argv) == 2:
        print 'Using C! :)'
        func = fiblib.fib
    else:
        print 'Using Python! :('
        func = fib

    for i in range(32):
        print func(i)


#include <stdio.h>
/*
 * compile with:
gcc -shared -Wl,-soname,fib -o fib.so -fPIC fib.c
*/

int fib(int n)
{
    if (n == 0) {
        return 0;
    }
    else if (n == 1) {
        return 1;
    }
    else {
        return fib(n-1) + fib(n-2);
    }
}