==============一.注册界面================

page = """=============================
    ^(*￣(oo)￣)^欢迎进入注册界面：
    1.账号
    2.密码
============================="""
#获取本地账号函数：
def name_get(str1):
    str2 = ''
    for index in range(len(str1)):
        str2 += str1[index]
        if str1[index] == '/':
            break
    return str2

#注册用户函数:
def ddf():
    #第一次进入创建txt文件
    with open('user.txt', 'a', encoding='utf-8') as f:
        pass
    #输入账号判断是否存在，若存在则提示存在
    account_number = input('请输入账号:')
    with open('user.txt', encoding='utf-8') as f:
        user = f.readline()
        while user:
            if account_number + '/' == name_get(user):
                print('该账号已有，请重新输入')
                break
            user = f.readline()
        else:
            password = input('请输入密码:')
            with open('user.txt', 'a', encoding='utf-8') as f:
                user = f.write('%s\n' % (account_number + '/' + password))
            print('注册成功')
print(page)
ddf()

==============二.登录界面================

page = """=============================
    ^(*￣(oo)￣)^欢迎进入登录界面：
    1.账号
    2.密码
============================="""
def dyf():
    account_number = input('请输入账号:')
    password = input('请输入密码:')
    a = account_number + '/' + password
    with open('user.txt',encoding='utf-8') as f:
        user = f.readline()
        while user:
            if a + '\n' == user:
                print('成功进入')
                break
            user = f.readline()
        else:
            print('账户或者密码输错')
print(page)
dyf()