diy2.py

username = "python"
userpassword = "123456"
i=3
while True:
    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!")
        breakb
    if name!=username:
        print("yuwduwdwaytaef")
        continue
    if password!=username:
        print("fhefegyfgeyfe")
    else:
        print("wyfgsgfyjagyfygygf")
        exit()
print("欢迎来到贝尔编程!")