Python实现全排列的打印
本文为大家分享了Python实现全排列的打印的代码,供大家参考,具体如下
问题:输入一个数字:3,打印它的全排列组合:123 132 213 231 312 321,并进行统计个数。
下面是Python的实现代码:
#!/usr/bin/env python # -*- coding: <encoding name> -*- ''' 全排列的demo input : 3 output:123 132 213 231 312 321 ''' total = 0 def permutationCove(startIndex, n, numList): '''递归实现交换其中的两个。一直循环下去,直至startIndex == n ''' global total if startIndex >= n: total += 1 print numList return for item in range(startIndex, n): numList[startIndex], numList[item] = numList[item], numList[startIndex] permutationCove(startIndex + 1, n, numList ) numList[startIndex], numList[item] = numList[item], numList[startIndex] n = int(raw_input("please input your number:")) startIndex = 0 total = 0 numList = [x for x in range(1,n+1)] print '*' * 20 for item in range(0, n): numList[startIndex], numList[item] = numList[item], numList[startIndex] permutationCove(startIndex + 1, n, numList) numList[startIndex], numList[item] = numList[item], numList[startIndex] print total
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