python 注册登录(文件操作)

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

过程

1）用户交互-注册用户、密码

2）写入文件

3）while循环，3次机会

4）用户交互-输入用户、密码

5）读文件

6）str比较