78 lines
3.2 KiB
Python
78 lines
3.2 KiB
Python
# _*_ coding: utf-8 _*_
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"""
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python_coroutine.py by xianhu
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"""
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import asyncio
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import aiohttp
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import threading
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# 生产者、消费者例子
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def consumer(): # 定义消费者，由于有yeild关键词，此消费者为一个生成器
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print("[Consumer] Init Consumer ......")
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r = "init ok" # 初始化返回结果，并在启动消费者时，返回给生产者
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while True:
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n = yield r # 消费者通过yield关键词接收生产者产生的消息，同时返回结果给生产者
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print("[Consumer] conusme n = %s, r = %s" % (n, r))
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r = "consume %s OK" % n # 消费者消费结果，下个循环返回给生产者
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def produce(c): # 定义生产者，此时的 c 为一个生成器
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print("[Producer] Init Producer ......")
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r = c.send(None) # 启动消费者生成器，同时第一次接收返回结果
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print("[Producer] Start Consumer, return %s" % r)
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n = 0
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while n < 5:
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n += 1
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print("[Producer] While, Producing %s ......" % n)
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r = c.send(n) # 向消费者发送消息，同时准备接收结果。此时会切换到消费者执行
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print("[Producer] Consumer return: %s" % r)
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c.close() # 关闭消费者生成器
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print("[Producer] Close Producer ......")
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# produce(consumer())
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# 异步IO例子：适配Python3.4，使用asyncio库
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@asyncio.coroutine
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def hello(index): # 通过装饰器asyncio.coroutine定义协程
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print('Hello world! index=%s, thread=%s' % (index, threading.currentThread()))
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yield from asyncio.sleep(1) # 模拟IO任务
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print('Hello again! index=%s, thread=%s' % (index, threading.currentThread()))@asyncio.coroutine
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loop = asyncio.get_event_loop() # 得到一个事件循环模型
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tasks = [hello(1), hello(2)] # 初始化任务列表
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loop.run_until_complete(asyncio.wait(tasks)) # 执行任务
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loop.close() # 关闭事件循环列表
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# 异步IO例子：适配Python3.5，使用async和await关键字
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async def hello1(index): # 通过关键字async定义协程
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print('Hello world! index=%s, thread=%s' % (index, threading.currentThread()))
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await asyncio.sleep(1) # 模拟IO任务
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print('Hello again! index=%s, thread=%s' % (index, threading.currentThread()))
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loop = asyncio.get_event_loop() # 得到一个事件循环模型
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tasks = [hello1(1), hello1(2)] # 初始化任务列表
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loop.run_until_complete(asyncio.wait(tasks)) # 执行任务
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loop.close() # 关闭事件循环列表
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# aiohttp 实例
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async def get(url):
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async with aiohttp.ClientSession() as session:
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async with session.get(url) as resp:
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print(url, resp.status)
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print(url, await resp.text())
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loop = asyncio.get_event_loop() # 得到一个事件循环模型
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tasks = [ # 初始化任务列表
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get("http://zhushou.360.cn/detail/index/soft_id/3283370"),
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get("http://zhushou.360.cn/detail/index/soft_id/3264775"),
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get("http://zhushou.360.cn/detail/index/soft_id/705490")
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]
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loop.run_until_complete(asyncio.wait(tasks)) # 执行任务
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loop.close() # 关闭事件循环列表
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