12306抢票软件

import json,time

# 读写数据库中的票数
def wr_info(sign,dic=None):
	if sign == "r":
		with open("ticket",mode="r",encoding="utf-8") as fp:
			dic = json.load(fp)
		return dic
		
	elif sign == "w":
		with open("ticket",mode="w",encoding="utf-8") as fp:
			json.dump(dic,fp)
		
# res = wr_info("r")
# print(res)
# dic = {"count":0}
# wr_info("w",dic)

# 抢票方法
def get_ticket(person):
	# 获取数据库中实际的票数
	dic = wr_info("r")
	print(dic)
	
	# 模拟一下网络延迟
	time.sleep(0.5)
	
	# 判断票数
	if dic["count"] > 0 :	
		print("%s抢到票了" % (person))
		dic["count"] -= 1
		wr_info("w",dic)
	else:
		print("%s没有抢到这张票" % (person))

def run(person,lock):
	
	# 查看剩余票数
	dic = wr_info("r")	
	print("%s 查询票数: %s" % (person , dic["count"]) )	
	
	
	# 上锁
	lock.acquire()
	# 开始抢票
	get_ticket(person)
	lock.release()

if __name__ == "__main__":
	lock = Lock()
	lst = ["科比","麦迪","高峰","姚明","邓肯","成龙","刘亦菲"]
	for i in lst:
		p = Process(target=run,args=(i,lock))
		p.start()