标签：not rac raw 跳过 put end 没有 and lis
Python 编程中 while 语句用于循环执行程序，即在某条件下，循环执行某段程序，以处理需要重复处理的相同任务。其基本形式为：
while 判断条件： 执行语句……
1 #!/usr/bin/python 2 3 count = 0 4 while (count < 9): print ‘The count is:‘, count count = count + 1 print "Good bye!"
1 The count is: 0 2 The count is: 1 3 The count is: 2 4 The count is: 3 5 The count is: 4 6 The count is: 5 7 The count is: 6 8 The count is: 7 9 The count is: 8 10 Good bye!
while 语句时还有另外两个重要的命令 continue，break 来跳过循环，continue 用于跳过该次循环，break 则是用于退出循环，此外"判断条件"还可以是个常值，表示循环必定成立，具体用法如下：
1 # continue 和 break 用法 2 3 i = 1 4 while i < 10: i += 1 if i%2 > 0: # 非双数时跳过输出 5 continue 6 print i # 输出双数2、4、6、8、10 7 8 i = 1 9 while 1: # 循环条件为1必定成立 10 print i # 输出1~10 11 i += 1 12 if i > 10: # 当i大于10时跳出循环 13 break
1 #coding=utf-8 2 #!/usr/bin/python 3 4 var = 1 5 while var == 1 : # 该条件永远为true，循环将无限执行下去 6 num = raw_input("Enter a number :") 7 print "You entered: ", num 8 9 print "Good bye!"
1 Enter a number :20 2 You entered: 20 3 Enter a number :29 4 You entered: 29 5 Enter a number :3 6 You entered: 3 7 Enter a number between :Traceback (most recent call last): 8 File "test.py", line 5, in <module> 9 num = raw_input("Enter a number :") 10 KeyboardInterrupt
在 python 中，for … else 表示这样的意思，for 中的语句和普通的没有区别，else 中的语句会在循环正常执行完（即 for 不是通过 break 跳出而中断的）的情况下执行，while … else 也是一样。
1 #!/usr/bin/python 2 3 count = 0 4 while count < 5: 5 print count, " is less than 5" 6 count = count + 1 7 else: 8 print count, " is not less than 5"
1 0 is less than 5 2 1 is less than 5 3 2 is less than 5 4 3 is less than 5 5 4 is less than 5 6 5 is not less than 5
1 #!/usr/bin/python 2 3 flag = 1 4 5 while (flag): print ‘Given flag is really true!‘ 6 7 print "Good bye!"
1 #!/usr/bin/python 2 # -*- coding: UTF-8 -*- 3 4 import random 5 while 1: 6 s = int(random.randint(1, 3)) 7 if s == 1: 8 ind = "石头" 9 elif s == 2: 10 ind = "剪子" 11 elif s == 3: 12 ind = "布" 13 m = raw_input(‘输入 石头、剪子、布,输入"end"结束游戏:‘) 14 blist = [‘石头‘, "剪子", "布"] 15 if (m not in blist) and (m != ‘end‘): 16 print "输入错误，请重新输入！" 17 elif (m not in blist) and (m == ‘end‘): 18 print "\n游戏退出中..." 19 break 20 elif m == ind : 21 print "电脑出了： " + ind + "，平局！" 22 elif (m == ‘石头‘ and ind ==‘剪子‘) or (m == ‘剪子‘ and ind ==‘布‘) or (m == ‘布‘ and ind ==‘石头‘): 23 print "电脑出了： " + ind +"，你赢了！" 24 elif (m == ‘石头‘ and ind ==‘布‘) or (m == ‘剪子‘ and ind ==‘石头‘) or (m == ‘布‘ and ind ==‘剪子‘): 25 print "电脑出了： " + ind +"，你输了！"
1 输入 石头、剪子、布,输入"end"结束游戏:石头 2 电脑出了： 石头，平局！ 3 输入 石头、剪子、布,输入"end"结束游戏:石头 4 电脑出了： 剪子，你赢了！ 5 输入 石头、剪子、布,输入"end"结束游戏:
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标签：not rac raw 跳过 put end 没有 and lis
原文地址：https://www.cnblogs.com/pypypy/p/12142241.html
