test.py

from timeit import timeit
from ctypes import *

size = 10
l = list()
arr = (c_int * size)()

def test(x):
    for n in range(x):
        l.append(n)

def testarr(x):
    for n in range(x):
        arr[n] = n

if __name__ == '__main__':
    print(timeit("test(size)", setup="from __main__ import test, size"))
    print(timeit("testarr(size)", setup="from __main__ import testarr, size"))