# 需求：猜年龄，可以让用户最多猜三次

age = 60

for i in range(3):

	guess = int(input("Input Age: "))

	if guess > age:

		print("Too bigger.")

	elif guess < age:

		print("Too smaller.")

	else:

		print("You got it!")

		break

	if i+1 is 3:

		print("3 times lost.")

# 需求：猜年龄，每隔三次，问他一下还想不想再玩。

import sys

age = 60

i = 0

while True:

	i += 1

	guess = int(input("Input Age: "))

	if guess > age:

		print("Too bigger.")

	elif guess < age:

		print("Too smaller.")

	else:

		print("You got it!")

		break

	if i%3 is 0:

		flag = input("Go on. Yes or No? ")

		if flag.upper() == "YES":

			pass

		elif flag.upper() == "NO":

			break

# 编写登陆接口:

#     输入用户名密码

#     认证成功后显示欢迎信息

#     输错三次后锁定

# 重点是 *锁定*

import getpass

f = open("lock_user.txt", "r+")

lock = f.read().strip()   #So important

i = 1

while True:

    username = input("Input your username: ")

    if username == lock:

    	print("The username is locked.")

    	break

    else:

    	password = getpass.getpass("Input your password: ")

    	if username == 'liukai' and password == 'liukai123':

    		print('Welcome!')

    		break

    	else:

    		print('Error.')

    		i += 1

    if i == 4:

    	f.write(username + "\n")

    	break

f.close()