CPS in Python

factorial_cps.py

def factorial(n):
  if n == 0:
    return 1

  return factorial(n - 1) * n


def factorial_cps(k, n):

  if n == 0:
    k(1)
  else:
    factorial_cps(
        lambda x : k(n * x),
        n - 1
        )


if __name__ == '__main__':
  factorial_cps(print, 5)