Pascal triangle

import os

def faktorialis (a):
        s = 1
        for szam in range(1,a+1):
                s = s*szam
        return s
a = int(input ("szam:"))

def pascalharomszog (i):
        for n in range(i):
                s = ""
                for k in range (n+1):
                        e = faktorialis(n)
                        f = faktorialis(n-k)
                        g = faktorialis(k)
                        s = s + str(int((e/(f*g))))+" "
                print (s.center(int(os.popen('stty size', 'r').read().split()[1]), " "))
pascalharomszog(a)