python8.4景区买票

from threading import Thread
import threading
lock=threading.Lock()
num=100
#定义买票方法
def sale(name):
lock.acquire()
global num
num=num-1
print(name,"买出一张，剩余：",num,"张！")
lock.release()

while 1==1:
if num>0:
c1=Thread(target=sale,args=("A窗口",))
c2=Thread(target=sale,args=("B窗口",))
c1.start()
c2.start()

else:
break

print("票已售完！")