Python基础-用户验证

一、项目需求

　　1、根据用户名和密码，验证用户是否可登陆

　　2、允许一次执行可验证三次

　　3、当用户名输错三次后，该用户名锁定，永久不可登陆

二、代码如下

　　

#!/usr/bin/env python
#-*- coding:utf-8 -*-
#import operator
n = 0
username="user123"
password="123.abc"
count_dict={}
tmp_dict={}
with open("lock",mode="r+",encoding="utf8") as f_read,open("lock_tmp",mode="a+",encoding="utf8") as f_write:
#lock文件和lock_tmp要先创建
    while n<3:
        name=input("please input username:").strip()
        pwd=input("please input passwd:").strip()
        for line in f_read:
            if name in line:
                print("当前用户已经被锁定，请联系管理员！！")
                exit()
        if name == username and pwd == password:
            print("欢迎%s登录"%username)
            exit()
        else:
            print("用户名或密码错误，请重新输入！")
            f_write.write(name+"
")
            if name not in tmp_dict:
                tmp_dict[name]=1
            else:
                tmp_dict[name]+=1
        n+=1
    # print(tmp_dict)
    for line in f_write.readline():
        line = line.strip()
        count = count_dict.setdefault(line,0)
        count+=1
        count_dict[line]=count
    print(count_dict)
    f_write.seek(0)
    for k in count_dict.keys():
        print(k,count_dict[k])
        # print(count_dict[k])
        if count_dict[k] >= 3:
            f_read.write(k+"
")
    for k1 in tmp_dict.keys():
        if tmp_dict[k1]>=3:
            f_read.write(k1+"
")