python 循环使用 while 或 for 语句实现用户名密码输错三次退出

如有错误欢迎大家指出，新手初来乍到。程序没那么复杂，是最简单的。

一、需求

编写登录文件 .py
1. 输入用户名密码
2. 正确，输出欢迎登录
3. 当输入用户名和密码小于 3 次，输入用户名或者密码错误，提示用户名或者密码错误。再次输入用户名和密码，剩余输入次
数。
3. 当输错三次后退出

二、流程图

 

三、代码

for

 

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



user = "zhangjinglei"
password = "lei100103"
count = 0;
for i in range(3):    
    username = input("username:")
    password = input("password:")
    if username == user and password == password:
        print("Welcome Login")
        count = 3
        break
    else:
        print("Wrong username or password")
        count += 1
        print("you can try", 2 - i, "times")

 

while

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



user = "zhangjinglei"
password = "lei100103"
count = 0;
while count < 3:    
    username = input("username:")
    password = input("password:")
    if username == user and password == password:
        print("Welcome Login")
        count = 3
    else:
        print("Wrong username or password")
        count += 1
        print("you can try", 3 - count, "times")

四、验证结果
1.for 验证结果

2.whlie验证结果