def eater():    print(‘start to eat‘)    while True:        food=yield        print(‘is eating food:%s‘%food)def producer():    dog=eater()    next(dog) # 先next一次唤醒协程函数    #然后下面的操作都是dog.send（值）    food1=‘北京烤鸭‘    food2=‘鱼香肉丝‘    dog.send(food1)    dog.send(food2)producer()输出结果：start to eatis eating food:北京烤鸭is eating food:鱼香肉丝