python登录模块开发【两个对比模块】

#读取一行用户信息进行对比：
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import json

def utf8():

    f = open('db','r')
    for i in f:
        txt = i.strip().split("|")
        admin = txt[0]
        passwd = txt[1]
        return admin,passwd

def login(name,passwd):
    user = input("请输入用户:")
    pwd = input("请输入密码:")
    if name == user and passwd == pwd:
        print("登录成功！")
    elif name == user and passwd != pwd:
        print("密码不正确，请重试！")
    elif name != user:
        print("用户账户不存在！")
    else:
        print("请联系管理员！")

def regester():
    user = input("请输入用户:")
    pwd = input("请输入密码:")
    print("注册成功")

def main():
    i = input("1、选择登录操作！2、选择注册操作！")
    if i=='1':
        admin = utf8()[0]
        passwds = utf8()[1]
        print(admin,passwds)
        login(admin,passwds)
    elif i=='2':
        regester()

if __name__ == '__main__':
    main()

#读取文件多行用户信息进行判断对比。

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import json

def login(name,passwd):
    f = open('db','r')
    # print(type(f))
    for i in f:
        txt = i.strip().split("|")
        usr = txt[0]
        pwd = txt[1]
        if name == usr and passwd == pwd:
            print("登录成功！")
        elif name == usr and passwd != pwd:
            print("密码不正确，请重试！")
        else:
            pass

def regester():
    user = input("请输入用户:")
    pwd = input("请输入密码:")
    usr = user + '|' + pwd +'\n'
    f = open('db','a')
    f.write(usr)
    f.close()
    print("注册成功")

def main():
    i = input("1、选择登录操作 2、选择注册操作:")
    if i=='1':
        admin = input("请输入用户：")
        passwds = input("请输入密码：")
        login(admin,passwds)
    elif i=='2':
        regester()
    else:
        print("请重新选择：")
        main()

if __name__ == '__main__':
    main()