#!/usr/bin/env python

 # -*- coding:utf-8 -*-

 #用户登录，三次错误机会

 """

 导入getpass，给x赋值为1，while真，循环开始，

 user的赋值等于用户输入的内容，pwd的赋值等于用户输入的内容并且不可见

 如果用户输入user的赋值等于"admin"而且用户输入pwd的赋值等于"admin888"

 打印"login successfully!(登陆成功！)"换行 打印"welcome!:(欢迎:)user",break跳出当前循环

 否则如果x的赋值等于3，打印"Failure three times!(失败三次！)"break跳出当前循环

 否则打印"login failure!There are three more chances!(登录失败！有三次机会)"

 x的赋值每循环一次加1，当循环3次后就满足了x赋值为3，break跳出当前循环！

 """

 import getpass

 x = 1

 while True:

     user = raw_input("user:")

     pwd = getpass.getpass('password:')

     if user == "admin" and pwd == "admin888":

         print("login successfully!" + "\n" +"welcome!:" + user)

         break

     elif x == 3:

         print("Failure three times!")

         break

     else:

         print("login failure!There are three more chances!")

     x += 1