diy2.py

username = "p1n"
userpassword = "1"
i = 3
while True:
    if i >0:
        name = input("请输入用户名:")
        password = input("请输入密码:")
        i-=1
        if name == username and password == userpassword:
            print("登录成功!")
            break
        if username != name:
            print('你名字错了')
            continue
        if userpassword != password:
            print('你密码错了')
    else:
        print('没机会了，毁灭吧')
        exit()
print("欢迎来到贝尔编程!")