i=5
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("用户名不存在，请重新输入")
            print("温馨提示:您还有"+str(i)+"次机会")
        if password != username:
            print("密码输入有误，请重新输入")
            print("温馨提示:您还有"+str(i)+"次机会")
            continue
    else:
        print("你的账户已被锁定，请一个小时后再来")
        exit()
print("欢迎来到贝尔编程!")