Python經典演算法片段

將一個正整數分解質因數

#!/bin/env python2
# -*- coding: UTF-8 -*-
def reduceNum(n):
    print '{} = '.format(n),
    if not isinstance(n, int) or n <= 0 :
        print '請輸入一個正確的數字 !'
        exit(0)
    elif n in [1] :
        print '{}'.format(n)
    while n not in [1] : # 迴圈保證遞迴
        for index in xrange(2, n + 1) :
            if n % index == 0:
                n /= index # n 等於 n/index
                if n == 1: 
                    print index 
                else : # index 一定是素數
                    print '{} *'.format(index),
                break

輸出乘法口訣表

#!/bin/env python2
# -*- coding: UTF-8 -*-
for i in range(1, 10):
    print 
    for j in range(1, i+1):
        print "%d*%d=%d" % (i, j, i*j),

輸出斐波那契數

#!/bin/env python2
# -*- coding: UTF-8 -*-
def fib(n):
    if n==1 or n==2:
        return 1
    return fib(n-1)+fib(n-2)