yield实现异步

def cash_out(amount):    while amount >0:        amount-=1        yield 1        print(‘get again %s‘ %amount)atm=cash_out(5)print(type(atm))print(atm.next())print(234234)print(atm.next())

import timedef consumer(name):    print("%s 准备吃包子啦!" %name)    while 1:        baozi = yield        print("包子[%s]来了，被[%s]吃了!" %(baozi, name))

def producer():    c = consumer(‘A‘)    c2 = consumer(‘B‘)    c.next()    c2.next()    print("老子开始准备做包子啦!")    for i in range(10):        time.sleep(1)        print("做了2个包子!")        c.send(i)        c2.send(i)producer()