python中生成器的两段代码

生产者-消费者经典单线程问题

import time

def consumer(name):

    print("%s 准备吃包子啦!" %name)

    while True:

       baozi = yield

 

       print("包子[%s]来了,被[%s]吃了!" %(baozi,name))

 

def producer(name):

    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("alex")

执行加一的生成器：

def gen(x):
    count = x
    while True:
        val = (yield count)
        if val is not None:
            count = val
        else:
            count += 1

 

f = gen(5)
print f.next()
print f.next()
print f.next()
print '===================='
print f.send(9)#发送数字9给生成器
print f.next()
print f.next()