import time

 from threading import Lock, Thread

 noodle_lock = Lock()

 fork_lock = Lock()

 def eat1(name):

     noodle_lock.acquire()

     print('%s拿到面了'%name)

     fork_lock.acquire()

     print('%s拿到叉子了'%name)

     print('%s吃面'%name)

     fork_lock.release()

     noodle_lock.release()

 def eat2(name):

     fork_lock.acquire()

     print('%s拿到叉子了' % name)

     time.sleep(1)

     noodle_lock.acquire()

     print('%s拿到面了'%name)

     print('%s吃面'%name)

     noodle_lock.release()

     fork_lock.release()

 Thread(target=eat1,args=('alex',)).start()

 Thread(target=eat2,args=('Egon',)).start()

 Thread(target=eat1,args=('bossjin',)).start()

 Thread(target=eat1,args=('nezha',)).start()

 import time

 from threading import Lock,Thread

 def func(lock):

     global n

     #加锁保证了n不会被多个线程操纵

     #获取锁的钥匙，加锁

     lock.acquire()

     temp = n

     time.sleep(0.2)#睡眠0.2s

     n = temp -1

     #释放锁

     lock.release()

 n = 10

 t_lst = []

 lock = Lock()

 for i in range(10):

     t = Thread(target=func,args=(lock,))

     t.start()

     t_lst.append(t)

 for t in t_lst:t.join()

 print(n)