i = 3
username = "ayi"
password = "123"
x = "yes"
j = 0
while i > 0:
    a = input("请输入用户名：")
    b = input("请输入密码：")
    i -= 1
    j += 1

    if username == a and password == b:
        print("欢迎进入阿一的世界！")
        break
    else:
        if i == 0:
            print("机会用完。")
            y = input("是否想请爸爸帮忙？")
            if y == x:
                i = 3
                if j == 6:
                    print("为你的坚持喝彩")
                    print("欢迎进入阿一的世界！")
                    break
            else:
                print("那请去别处")
                break
        if i == 3:
            print("好吧好吧，再给你3次机会。")
        else:
            print("账号密码错误，您还有%s次机会" %(i))