while循环

while循环是死循环，没有触发条件退出的话会一直运行

没有触发条件

count = 0
while True:
    print("count.",count)
    count +=1

循环100次退出

count = 0
while True:
    print("count",count)
    count +=1
    if count == 100:
       break

还是猜年龄游戏，让用户不断的猜年龄，但只给最多3次机会，再猜不对就退出程序

#! /usr/bin/env python
# -*- coding: utf-8 -*-

my_age = 28
count = 0

while count < 3:
    guess_age = int(input("input your guess age:"))
    if guess_age == my_age:
        print("Congratulations, you got it!")
        break
    elif guess_age > my_age:
        print("think smaller...")
    else:
        print("think bigger!")
    count += 1
else:
    print("you have tried too many times...")

继续猜年龄游戏，让用户不断的猜年龄，猜3次后，问是否继续？输入n就退出程序，输入其它就继续

#! /usr/bin/env python
# -*- coding: utf-8 -*-
# Author: Ruan

my_age = 28

count = 0

while count < 3:
    guess_age = int(input("input your guess age:"))
    if guess_age == my_age:
        print("Congratulations, you got is!")
        break
    elif guess_age > my_age:
        print("think smaller...")
    else:
        print("think bigger!")
    count += 1

    if count == 3:
        continue_confirm = input("do you want to keep guessing...?")
        if continue_confirm != 'n':
            count = 0

PS:while---else---是python独有的语法，其它语言中不能使用此方法。