diy2.py

i=3
username = "python"
userpassword = "123456"
while True:
    a= input("请输入用户名:")
    b = input("请输入密码:")
    i-=1
    if i>0:
        if a == username and b == userpassword:
            print("登录成功!")
            break
        if a!=username:
            print("账号输入错误，请重新输入") 
            continue
    else:
        print("账号被锁定，请带身份证来本司解锁")
        exit()
print("欢迎来到贝尔编程!")