How to include a C function in Python?

Question

I want to use a function made in C.

Example:

I have a function

int swap(){ 
    printf("lista");
}

And I want to call you by Python...

Answer 1

The first thing you will have to do is generate a dynamic library with your C code. On Linux this means a bilioteca ". so" and in windows would be a ". dll"

Assuming you are on Linux and your C file name is "hello. c", gcc can generate this dynamic library through following command:

gcc -shared -o libhello.so -fPIC hello.c

Now, to call this Python library you can use the library ctypes, which is part of the standard Python library:

import ctypes

libhello = ctypes.cdll.LoadLibrary("./libhello.so")
libhello.swap()

For more advanced examples, where the function receives or returns parameters, you will need to convert the Python format data to C format. See the ctypes documentation for details.