# Pastebin wABvdfFI
dev@MacBook-Pro:~/tmp$ cat x.c
#include <stdarg.h>
#include <stdio.h>

// Variadic function to add numbers
int add_numbers(int n, ...)
{
    int Sum = 0;
 
    // Declaring pointer to the
    // argument list
    va_list ptr;
 
    // Initializing argument to the
    // list pointer
    va_start(ptr, n);
 
    for (int i = 0; i < n; i++)
 
        // Accessing current variable
        // and pointing to next one
        Sum += va_arg(ptr, int);
 
    // Ending argument list traversal
    va_end(ptr);
 
    return Sum;
}
dev@MacBook-Pro:~/tmp$ cat x.,py
cat: x.,py: No such file or directory
dev@MacBook-Pro:~/tmp$ cat x.py
import ctypes

lib = ctypes.CDLL("/Users/dev/tmp/x.dylib")
add = lib.add_numbers
add.argtypes = (ctypes.c_int, ctypes.c_int, ctypes.c_int)
add.restype = ctypes.c_int
print(add(2, 3, 5))
dev@MacBook-Pro:~/tmp$ python x.py
19665968
dev@MacBook-Pro:~/tmp$