if...else 小练习

# 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()