利用python实现简单登陆注册系统

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


def login(username,password):
    '''

    :param username:用户名
    :param password:密码
    :return: True:登陆成功  False:登陆失败
    '''
    f = open('log','r',encoding='utf-8')
    for line in f:
        line = line.strip()
        line_list = line.split('$')
        if username ==line_list[0] and password ==line_list[1]:
            print('success')
            return True
        return False

def register(username,password):
    '''

    :param username:
    :param password:
    :return:
    '''
    with open('log','a',encoding='utf-8') as f:
        temp = '
' + username + '$' + password
        f.write(temp)
    return True

def user_exit(username):
    '''

    :param username:
    :return:
    '''
    with open('log','r',encoding='utf-8') as f:
        for line in f:
            line = line.strip()
            line_list = line.split('$')
            if line_list[0]==username:
                return True
    return False

def main():
    print('欢迎登陆XX系统')
    inp = input('1:登陆；2：注册')
    user = input('user:')
    pwd = input('pwd:')
    if inp =='1':
        is_login = login(user,pwd)
        if is_login:
            print('success')
        else:
            print('fail')
    elif inp =='2':
        is_exit = user_exit(user)
        if is_exit:
            print('already register')
        else:
            result = register(user,pwd)
            if result:
                print('register sucess')
            else:
                print('resgister faild')
main()