comb.py

# python 2.7.9
# get factorial
def fact(n):
  ret = 1
  for i in range(1, n+1):
    ret = ret * i
  return ret

# get combination
def comb(n, k):
  return fact(n) / fact(k) / fact(n-k)

# print result using iteration
for i in range(6):
  for j in range(i+1):
    print '%dC%d = %d' % (i, j, comb(i, j)),
  print ''