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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import logging
import random

logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s -- %(filename)s:%(lineno)d [%(message)s]',
    stream=sys.stdout,
)

def get_item():
    item = random.sample(range(1, 10), 3)
    return item


def Consume():
    while True:
        item = yield
        logging.debug('Getting %s' % (item))


def Produce(consumer):
    while True:
        item = get_item()
        logging.debug('Producing %s' % (item))
        consumer.send(item)


if __name__ == '__main__':
    consumer = Consume()
    # 这里next的含义时首先要运行到第一个yield，也可以使用consumer.send(None)
    next(consumer)
    producer = Produce(consumer)    

    next(producer)