How can I make a C program and a Python Program to talk to each other?

First of all you need to create a "shared library file" in *Nix case it's identified by extension ".so" if you are using GCC then create a shared library for you C code. Example: //file1.c #include<stdio.h> void hello(const char *name) {     printf("\nHello......%s",name); } --------------------------------------------------------- To make it shared library, $ gcc -c -Wall file1.c $ gcc -shared -o libfile.so file1.o --------------------------------------------------------- Now, open up your python shell, go to directory where shared file resides from ctypes import cdll sh_obj=cdll.LoadLibrary('./Page on Libfile') #NOTE "./" sh_obj.hello('Python from C') #C function name, with parameters You done it. Answer to second question: To write a C code in Python No Idea. But you can do some Python stuff in C using Python Development library[3]. For references: [1] http://www.cprogramming.com/tutorial/shared-libraries-linux-gcc.html [2] http://docs.python.org/2/library/ctypes.html [3] http://docs.python.org/2/extending/extending.html

You need to mention what kind of communication you are trying to achieve. If you want to make use of C functions in Python, try Swig ( http://www.swig.org/ ). You can try a client-server mechanism, where a client gives requests for the server to execute. ( You can start a web server in python in a jiffy; http://web.py , tornado etc.; Simple curl commands can be requests ) If its just going to be some data exchange and you want to do it without much ado; try using a third-party server like redis; everything is gonna be in memory and their respective language clients can get/put data ( so should be pretty fast )