python的题目 实在不会了 求大牛指点

Question

Answer 1

系统注册和模拟登录，将用户写成字典形式，可以试试如下代码：

users={'John':'Abc12345','Marry':'Mar11111','Tommy':'To123456'}
t=input('choice:register or login(r/l):')
if t=='r':
    name=input('username:')
    if name in  users:
        print('the user already exists!')
    else:
        
        psw=input('input password(numbers  or characters):')
        if all([x.isalnum() for x in psw]) and len(psw)==8:
            users.update({name:psw})
        else:
            print('invalid password.')
if t=='l':
    name=input('name:')
    psw=input('password:')
    if name in users:
        if psw==users[name]:
            print('login success!')
        else:
            print('password is wrong')
    else:
        print('Not found.')

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