Python之简单的用户名密码验证
题目要求:
输入用户名密码
认证成功后显示欢迎信息
输错三次后锁定
#要求使用文件存储用户名和密码,每次从文件读入用户名和密码用来验证,如果输错三次密码该账户会被锁定,并讲锁定的用户名写入文件
#账号密码正确输出欢迎信息
涉及知识点:
文件读写操作
循环流程
程序判断流程
经过分析构思
我写的第一版代码如下:
#Author jack # _*_ coding: utf-8 _*_ #date 2019-08-14 ''' 作业一:编写登录接口 输入用户名密码 认证成功后显示欢迎信息 输错三次后锁定 ''' #判断用户账号密码 def check_pass(username, password): with open('userfile.txt', 'r+') as f: content = f.readlines() for i in content: if i.split(',')[0] == username and i.split(',')[1].strip('\n') == password: return True break else: return False #判断用户名是否锁定: def isLock(username): with open('locklist.txt', 'r') as f: cont = f.read() if username in cont: return False else: return True #写锁定用户名到locklist,如果用户输错三次,就调用此函数,讲锁定的用户名写入此文件 def writeErrlist(username): with open('locklist.txt', 'a+') as f: f.write(username) f.write('\n') def main(): count = 0 #存储输密码次数 while count < 3: username = input('Please input your username: ') is_lock = isLock(username) if is_lock: passwd = input('Please input your password: ') result = check_pass(username, passwd) if result: print('welcome back! "{}"'.format(username)) break else: count += 1 if count < 3: print('Invalid username or password, Please try again!') else: print('Too many attempts, Your account has benn locked.') writeErrlist(username) else: print('Your account has been locked!!!') if __name__ == "__main__": main()