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，若是输错三次密码该帐户会被锁定，并讲锁定的用户名写入文件

#帐号密码正确输出欢迎信息

 

涉及知识点:

文件读写操做

循环流程

程序判断流程

通过分析构思

我写的初版代码以下：

#Author jack
# _*_ coding: utf-8 _*_
#date   2019-08-14
'''
做业一：编写登陆接口
    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
'''
#判断用户帐号密码                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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，若是用户输错三次，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()