name = input("请注册用户：")

password = input("请注册密码：")

with open(file="user", mode='w', encoding='utf-8') as f:

    f.write('{}\n{}'.format(name, password))　　　　# 将用户、密码写入文件

print("恭喜%s，注册成功！" % name)

count = 0

li = []

while count < 3:　　# 三次输入机会

    _name = input("请输入用户：")

    _password = input("请输入密码:")

    with open(file='user', mode='r+', encoding='utf-8') as f:　　# 读取文件

        for line in f:

            #li.append(line)

        if li[0].strip() == _name and li[1].strip() == _password:

            print("登录成功！")

            break

        else:

            print("请重新输入！")

        if count == 2:

            print("笨蛋，回家养猪去吧！！！！！")

        count += 1

# 改良
name = input("请注册用户：")

password = input("请注册密码：")

with open(file="{}".format(name), mode='w', encoding='utf-8') as f:

    f.write('{}\n{}'.format(name, password))

print("恭喜%s，注册成功！" % name)

count = 0

# li = []

while count < 3:

    _name = input("请输入用户：")

    _password = input("请输入密码:")

    with open(file="{}".format(name), mode='r+', encoding='utf-8') as f:

        # for line in f:

        #     li.append(line)

        li = f.readlines()

        if li[0].strip() == _name and li[1].strip() == _password:

            print("登录成功！")

            break

        else:

            print("请重新输入！")

        if count == 2:

            print("笨蛋，回家养猪去吧！！！！！")

        count += 1