class Factorial: '''Calculate the n-th factorial via recursion and iteration method \ provided given number >= 0 ''' def __init__(self,n): self.n = n def byRecursion(self,n): if (n 1): ret = ret * n n = n - 1 return ret def prt(self): print 'by Recursion: ' + str(self.byRecursion(self.n)) print 'by Iteration: ' + str(self.byIteration(self.n))