diy2.py

i=3
username = "python"
userpassword = "123456"
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 name != username
        print("用户名错误!请重新输入")
        continue
    if password != userpassword
        print("密码错误!请重新输入")
    else:
        print("账号已被锁定，请到我司解锁")

        print("欢迎来到贝尔编程!")
# 请用input()实现用户输入账号、密码的功能