lk.py

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("密码输入有误，请重新输入！")
    elif:
        
        print("你的账户已被锁定，请一个小时以后在来")
        exit()
print("欢迎来到贝尔编程！")