问Python哲学家就餐问题如何实现持续就餐与饥饿？

(代码目前问题是，第一轮进餐完成后，思考然后再饥饿，此时不能够继续进餐)

import time

import threading

class Philosophy(threading.Thread):

def __init__(self, key, lefthand, righthand, hungry):

threading.Thread.__init__(self)

self.key = key # 哲学家编号

self.lefthand = lefthand # True表示哲学家拿起筷子,False表示哲学家没有拿起筷子

self.righthand = righthand

self.hungry = hungry # True表示哲学家饿了

def pick(self):

threadLock.acquire()

if chopsticks[self.key] and chopsticks[(self.key + 1) % 5] and not self.lefthand and not self.righthand and self.hungry:  # 可以拿筷子

time.sleep(0.5)

chopsticks[(self.key + 1) % 5] = False

self.lefthand = True

print('哲学家%s拿起了左边的筷子' % self.key)

time.sleep(0.5)

chopsticks[self.key] = False # 哲学家的筷子被拿

self.righthand = True # 哲学家右手拿起筷子

print('哲学家%s拿起了右边的筷子' % self.key)

threadLock.release()

def eat(self):

if self.lefthand and self.righthand and self.hungry:  # 可以开始吃饭

time.sleep(0.5)

print('哲学家%s开始吃饭' % self.key)

time.sleep(2)

print('哲学家%s吃完饭了' % self.key)

self.hungry = False

time.sleep(0.5)

print('哲学家%s放下筷子开始思考' % self.key)

self.lefthand = False # 哲学家左手放下筷子

self.righthand = False # 哲学家右手放下筷子

chopsticks[self.key] = True # 哲学家的筷子可以用

chopsticks[(self.key + 1) % 5] = True # 哲学家右边的筷子可以用

time.sleep(5)

self.hungry == True

print('哲学家%s思考后饥饿' % self.key)

def run(self):

while True:

self.pick()

self.eat()

threadLock = threading.Lock()

chopsticks = [True, True, True, True, True]

philosophy0 = Philosophy(0, False, False, True)

philosophy1 = Philosophy(1, False, False, True)

philosophy2 = Philosophy(2, False, False, True)

philosophy3 = Philosophy(3, False, False, True)

philosophy4 = Philosophy(4, False, False, True)

philosophy0.start()

philosophy1.start()

philosophy2.start()

philosophy3.start()

philosophy4.start()