蒸包子

import threading,time
zhenglong=[]
zheng_lock=threading.Lock()
W=threading.Condition(lock=zheng_lock)
chi_lock=threading.Lock()
E=threading.Condition(lock=chi_lock)
def zheng(name):
    while True:
         E.acquire()
         if zhenglong.__len__()==0:
             for i in range(1,11):
                zhenglong.append(i)
                time.sleep(0.3)
                print('{0}正在蒸第{1}个包子'.format(name,i))
             print('包子蒸完了，唤醒吃货')
             E.notify_all()
         E.release()
         W.acquire()
         W.wait()
         W.release()
threading._start_new_thread(zheng,('厨师',))
def chihuo(name):
    while True:
        E.acquire()
        global zhenglong
        if zhenglong.__len__()==0:
            W.acquire()
            W.notify_all()
            W.release()
            E.wait()
        else:
            s=zhenglong.pop()
            print('{0}正在吃{1}个包子，剩余{2}个包子'.format(name,s,zhenglong.__len__()))
            time.sleep(0.1)
        E.release()
threading._start_new_thread(chihuo,('小刚',))
threading._start_new_thread(chihuo,('小明',))
threading._start_new_thread(chihuo,('小hong',))
input()