login

这是一个登入窗口，会判断用户名和密码是否正确，密码输入3次错误后，把该用户添加到blacklist，不允许登入。

#!/usr/bin/env python
#-*- coding:utf-8 -*-
# Li Rong Yang
"""
This is the login code.
"""
user_name = open("E:\\python学习视频\\username.txt") #读取用户名数据文件
name = user_name.read()
_name = name.split(",")#把数据文件中字符串转为列表
 
password = open("E:\\python学习视频\\password.txt")#读取密码数据文件
_pass = password.read()
_passs =_pass.split(",")#把数据文件中字符串转为列表
 
blacklist = open("E:\\python学习视频\\blacklist.txt")#读取黑名单数据文件
blacklistfile = password.read()
 
count = 0
 
while True:
    if count == 3:
        break
 
    user_input = input("Please enter a user name: ")#提示用户输入登入名
 
    if user_input in blacklist: #判断用户输入的登入名是否在黑名单中
        print("You are on the blacklist, Please contact the Administrator.")
        break
 
    if user_input in _name:#判断用户输入的登入名是否在白名单中
        for i in range(3):
            count += 1
 
            mi = input("Please enter a user password.")#提醒用户输入密码
            if mi in _passs:#判断用户输入的密码是否在密码数据文件中
                print("Welcome {_name}".format(_name = user_input))
                exit()
            else:
                print("Password error!!!")
                if count == 3:
                    write_blacklist = open("E:\\python学习视频\\blacklist.txt",'a')#密码输入错误3次后，把该用户拉入黑名单
                    write_blacklist.write(user_input + ',')
 
                    print("Password error 3 tiems,Please contact the Administrator.")
    else:
        print("Username error!!!")