python---爬虫相关性能（各个异步模块的使用，和自定义异步IO模块）
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一：线程池，进程池等相关文章了解
python---基础知识回顾（十）进程和线程（py2中自定义线程池和py3中的线程池使用）
python---基础知识回顾（十）进程和线程（协程gevent：线程在I/O请求上的优化）
python---异步IO(asyncio)协程
二：异步I/O模块的了解（同协程：线程在I/O请求上的优化）
（一）asyncio模块的使用
1.使用简单实例
import asyncio,time async def func1(num): print(num,"before func1.....") await asyncio.sleep(num) print(num,"after func1......") tasks = [ asyncio.ensure_future(func1(1)), asyncio.ensure_future(func1(3)), ] begin = time.time() loop = asyncio.get_event_loop() loop.run_until_complete(asyncio.gather(*tasks)) loop.close() end = time.time() print(end-begin)
1 before func1..... 3 before func1..... 1 after func1...... 3 after func1...... 3.003171682357788
（二）.异步获取网站资源（不支持requests模块），使用asyncio模块的socket请求完成
不支持requests请求的原因：
异步的实现，需要自动切换协程，需要用到await或者yield，
而requests模块不提供切换协程的条件，所以当第一条协程执行到请求部分就停下来了，等服务器响应，
不会切到其他的协程去执行。
requests会阻塞asyncio循环，所以会出现收不到服务器响应的情况。可以使用aiohttp替代requests解决这个问题。
使用asyncio实现requests请求获取资源
import asyncio,time async def func1(host,url=\'/\'): print(host,url) reader, writer = await asyncio.open_connection(host,80) request_header_content = \'\'\'GET %s HTTP/1.0\\r\\nHost: %s\\r\\n\\r\\n\'\'\'%(url,host) request_header_content = bytes(request_header_content,encoding="utf-8") writer.write(request_header_content) await writer.drain() text = await reader.read() print(host,url,text) writer.close() tasks = [ asyncio.ensure_future(func1(\'www.cnblogs.com\',\'/ssyfj/\')), asyncio.ensure_future(func1(\'www.baidu.com\')), asyncio.ensure_future(func1(\'www.ckook.com\',\'/forum.php\')), ] begin = time.time() loop = asyncio.get_event_loop() loop.run_until_complete(asyncio.gather(*tasks)) loop.close() end = time.time() print(end-begin)
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href="https://www.cnblogs.com/ssyfj/p/9219360.html">python---\\xe5\\xbc\\x82\\xe6\\xad\\xa5IO(asyncio)\\xe5\\x8d\\x8f\\xe7\\xa8\\x8b</a>\\r\\n\\t\\t\\t</div>\\r\\n\\t\\t\\t<div class="postCon"><div class="c_b_p_desc">\\xe6\\x91\\x98\\xe8\\xa6\\x81: \\xe7\\xae\\x80\\xe5\\x8d\\x95\\xe4\\xba\\x86\\xe8\\xa7\\xa3 \\xe5\\x9c\\xa8py3\\xe4\\xb8\\xad\\xe5\\x86\\x85\\xe7\\xbd\\xae\\xe4\\xba\\x86asyncio\\xe6\\xa8\\xa1\\xe5\\x9d\\x97\\xe3\\x80\\x82\\xe5\\x85\\xb6\\xe7\\xbc\\x96\\xe7\\xa8\\x8b\\xe6\\xa8\\xa1\\xe5\\x9e\\x8b\\xe5\\xb0\\xb1\\xe6\\x98\\xaf\\xe4\\xb8\\x80\\xe4\\xb8\\xaa\\xe6\\xb6\\x88\\xe6\\x81\\xaf\\xe5\\xbe\\xaa\\xe7\\x8e\\xaf\\xe3\\x80\\x82 \\xe6\\xa8\\xa1\\xe5\\x9d\\x97\\xe6\\x9f\\xa5\\xe7\\x9c\\x8b\\xef\\xbc\\x9a \\xe8\\xb0\\x83\\xe7\\x94\\xa8\\xe6\\xad\\xa5\\xe9\\xaa\\xa4\\xef\\xbc\\x9a \\xe7\\xae\\x80\\xe5\\x8d\\x95\\xe4\\xbd\\xbf\\xe7\\x94\\xa8\\xef\\xbc\\x9a 1 before func1 2 before func1 1 after func1 2 after func1 5.00528621673584 \\xe5\\xae\\x9a\\xe4\\xb9\\x89\\xe4\\xb8\\x80\\xe4\\xb8\\xaa\\xe5\\x8d\\x8f\\xe7\\xa8\\x8b\\xef\\xbc\\x88\\xe4\\xb8\\x8d\\xe5\\x90\\x8c\\xe4\\xba\\x8e\\xe4\\xb8\\x8a\\xe9\\x9d\\xa2\\xe7\\x9a\\x84\\xe5\\xae\\x9e\\xe4\\xbe\\x8b\\xef\\xbc\\x89 D:<a href="https://www.cnblogs.com/ssyfj/p/9219360.html" class="c_b_p_desc_readmore">\\xe9\\x98\\x85\\xe8\\xaf\\xbb\\xe5\\x85\\xa8\\xe6\\x96\\x87</a></div></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\t<div class="postDesc">posted @ 2018-06-24 16:28 \\xe5\\xb1\\xb1\\xe4\\xb8\\x8a\\xe6\\x9c\\x89\\xe9\\xa3\\x8e\\xe6\\x99\\xaf \\xe9\\x98\\x85\\xe8\\xaf\\xbb(4) \\xe8\\xaf\\x84\\xe8\\xae\\xba(0) <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9219360" rel="nofollow">\\xe7\\xbc\\x96\\xe8\\xbe\\x91</a></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\r\\n</div>\\r\\n\\r\\n\\r\\n<div class="day">\\r\\n\\t<div class="dayTitle">\\r\\n\\t\\t<a id="homepage1_HomePageDays_DaysList_ctl01_ImageLink" href="//www.cnblogs.com/ssyfj/archive/2018/06/23.html">2018\\xe5\\xb9\\xb46\\xe6\\x9c\\x8823\\xe6\\x97\\xa5</a>\\t\\t\\t\\t \\r\\n\\t</div>\\r\\n\\r\\n\\t\\r\\n\\t\\t\\t<div class="postTitle">\\r\\n\\t\\t\\t\\t<a id="homepage1_HomePageDays_DaysList_ctl01_DayList_TitleUrl_0" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9219257.html">python---await/async\\xe5\\x85\\xb3\\xe9\\x94\\xae\\xe5\\xad\\x97</a>\\r\\n\\t\\t\\t</div>\\r\\n\\t\\t\\t<div class="postCon"><div class="c_b_p_desc">\\xe6\\x91\\x98\\xe8\\xa6\\x81: \\xe6\\x8e\\xa8\\xe6\\x96\\x87\\xef\\xbc\\x9a\\xe7\\x8e\\xa9\\xe8\\xbd\\xac Python 3.5 \\xe7\\x9a\\x84 await/async \\xe9\\xa6\\x96\\xe5\\x85\\x88\\xe7\\x9c\\x8b\\xe6\\xad\\xa3\\xe5\\xb8\\xb8\\xe7\\x9a\\x84\\xe4\\xb8\\xa4\\xe4\\xb8\\xaa\\xe5\\x87\\xbd\\xe6\\x95\\xb0\\xe4\\xb9\\x8b\\xe9\\x97\\xb4\\xe7\\x9a\\x84\\xe6\\x89\\xa7\\xe8\\xa1\\x8c 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Python \\xe7\\x9a\\x84\\xe7\\x94\\x9f\\xe6\\x88\\x90\\xe5\\x99\\xa8\\xe9\\x9d\\x9e\\xe5\\xb8\\xb8\\xe7\\x9b\\xb8\\xe4\\xbc\\xbc\\xef\\xbc\\x8c\\xe4\\xb9\\x9f\\xe9\\x83\\xbd\\xe6\\x9c\\x89\\xe4\\xb8\\x80\\xe4\\xb8\\xaa send \\xe6\\x96\\xb9<a href="https://www.cnblogs.com/ssyfj/p/9219257.html" class="c_b_p_desc_readmore">\\xe9\\x98\\x85\\xe8\\xaf\\xbb\\xe5\\x85\\xa8\\xe6\\x96\\x87</a></div></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\t<div class="postDesc">posted @ 2018-06-23 23:28 \\xe5\\xb1\\xb1\\xe4\\xb8\\x8a\\xe6\\x9c\\x89\\xe9\\xa3\\x8e\\xe6\\x99\\xaf \\xe9\\x98\\x85\\xe8\\xaf\\xbb(7) \\xe8\\xaf\\x84\\xe8\\xae\\xba(0) <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9219257" rel="nofollow">\\xe7\\xbc\\x96\\xe8\\xbe\\x91</a></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\r\\n\\t\\t\\t<div class="postSeparator"></div>\\r\\n\\t\\t\\r\\n\\t\\t\\t<div class="postTitle">\\r\\n\\t\\t\\t\\t<a id="homepage1_HomePageDays_DaysList_ctl01_DayList_TitleUrl_1" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9218730.html">python---\\xe5\\x8d\\x8f\\xe7\\xa8\\x8b\\xe7\\x90\\x86\\xe8\\xa7\\xa3</a>\\r\\n\\t\\t\\t</div>\\r\\n\\t\\t\\t<div class="postCon"><div class="c_b_p_desc">\\xe6\\x91\\x98\\xe8\\xa6\\x81: \\xe6\\x8e\\xa8\\xe6\\x96\\x87\\xef\\xbc\\x9apython \\xe5\\x9f\\xba\\xe7\\xa1\\x80\\xe7\\x9f\\xa5\\xe8\\xaf\\x86\\xe5\\x9b\\x9e\\xe9\\xa1\\xbe\\xef\\xbc\\x88\\xe4\\xb8\\x83\\xef\\xbc\\x89\\xe8\\xbf\\xad\\xe4\\xbb\\xa3\\xe5\\x99\\xa8\\xe5\\x92\\x8c\\xe7\\x94\\x9f\\xe6\\x88\\x90\\xe5\\x99\\xa8 \\xe6\\x8e\\xa8\\xe6\\x96\\x87\\xef\\xbc\\x9aPython\\xe5\\x8d\\x8f\\xe7\\xa8\\x8b\\xe6\\xb7\\xb1\\xe5\\x85\\xa5\\xe7\\x90\\x86\\xe8\\xa7\\xa3\\xef\\xbc\\x88\\xe6\\x9c\\xac\\xe6\\x96\\x87\\xe8\\xbd\\xac\\xe8\\xbd\\xbd\\xe4\\xba\\x8e\\xe8\\xaf\\xa5\\xe6\\x96\\x87\\xe7\\xab\\xa0\\xef\\xbc\\x89 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class="clear"></div>\\r\\n\\t\\t\\r\\n\\t\\t\\t<div class="postSeparator"></div>\\r\\n\\t\\t\\r\\n\\t\\t\\t<div class="postTitle">\\r\\n\\t\\t\\t\\t<a id="homepage1_HomePageDays_DaysList_ctl04_DayList_TitleUrl_1" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9189422.html">Git\\xe5\\x92\\x8cGithub\\xe5\\x85\\xa5\\xe9\\x97\\xa8</a>\\r\\n\\t\\t\\t</div>\\r\\n\\t\\t\\t<div class="postCon"><div class="c_b_p_desc">\\xe6\\x91\\x98\\xe8\\xa6\\x81: \\xe6\\x8e\\xa8\\xe6\\x96\\x87\\xef\\xbc\\x9a\\xe5\\xae\\x98\\xe6\\x96\\xb9\\xe6\\x89\\x8b\\xe5\\x86\\x8c\\xef\\xbc\\x8c\\xe5\\x8d\\x81\\xe5\\x88\\x86\\xe8\\xaf\\xa6\\xe7\\xbb\\x86 \\xe6\\x8e\\xa8\\xe6\\x96\\x87\\xef\\xbc\\x9agit\\xe5\\x92\\x8cgithub\\xe5\\xbf\\xab\\xe9\\x80\\x9f\\xe5\\x85\\xa5\\xe9\\x97\\xa8 \\xe4\\xb8\\x80.git\\xe4\\xbd\\xbf\\xe7\\x94\\xa8 1.git\\xe5\\xae\\x89\\xe8\\xa3\\x85 \\xef\\xbc\\x881\\xef\\xbc\\x89windows 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1.\\xe9\\x85\\x8d\\xe7\\xbd\\xae\\xe5\\xae\\x89\\xe8\\xa3\\x85\\xe4\\xbe\\x9d\\xe8\\xb5\\x96\\xe7\\x8e\\xaf\\xe5\\xa2\\x83 2.\\xe4\\xb8\\x8b\\xe8\\xbd\\xbdshellinabox\\xe5\\x8c\\x85,\\xe5\\xbc\\x80\\xe5\\xa7\\x8b\\xe5\\xae\\x89\\xe8\\xa3\\x85 \\xef\\xbc\\x881\\xef\\xbc\\x89git\\xe8\\xbf\\x9c\\xe7\\xa8\\x8b\\xe8\\x8e\\xb7\\xe5\\x8f\\x96,\\xe5\\x85\\x8b\\xe9\\x9a\\x86\\xe6\\xba\\x90\\xe6\\x96\\x87\\xe4\\xbb\\xb6\\xe5\\x88\\xb0\\xe9\\xa1\\xb9\\xe7\\x9b\\xae\\xe7\\x9b\\xae\\xe5\\xbd\\x95 \\xef\\xbc\\x882\\xef\\xbc\\x89\\xe5\\x9c\\xa8\\xe9\\xa1\\xb5\\xe9\\x9d\\xa2<a href="https://www.cnblogs.com/ssyfj/p/9179587.html" class="c_b_p_desc_readmore">\\xe9\\x98\\x85\\xe8\\xaf\\xbb\\xe5\\x85\\xa8\\xe6\\x96\\x87</a></div></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\t<div class="postDesc">posted @ 2018-06-13 20:06 \\xe5\\xb1\\xb1\\xe4\\xb8\\x8a\\xe6\\x9c\\x89\\xe9\\xa3\\x8e\\xe6\\x99\\xaf \\xe9\\x98\\x85\\xe8\\xaf\\xbb(4) \\xe8\\xaf\\x84\\xe8\\xae\\xba(0) <a href 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\\xe5\\xb0\\x86baseurl\\xe6\\xb3\\xa8\\xe9\\x87\\x8a\\xe5\\x8e\\xbb\\xe6\\x8e\\x89\\xef\\xbc\\x8c\\xe4\\xb8\\xbamirrorlist\\xe5\\x8a\\xa0\\xe4\\xb8\\x8a\\xe6\\xb3\\xa8\\xe9\\x87\\x8a\\xe3\\x80\\x82\\xe7\\x84\\xb6\\xe5\\x90\\x8e\\xe5\\xb0\\x86enabeld=1\\xe5\\x8f\\x98\\xe4\\xb8\\xba0\\xef\\xbc\\x8c\\xe7\\xa6\\x81\\xe7\\x94\\xa8<a href="https://www.cnblogs.com/ssyfj/p/9178745.html" class="c_b_p_desc_readmore">\\xe9\\x98\\x85\\xe8\\xaf\\xbb\\xe5\\x85\\xa8\\xe6\\x96\\x87</a></div></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\t<div class="postDesc">posted @ 2018-06-13 17:06 \\xe5\\xb1\\xb1\\xe4\\xb8\\x8a\\xe6\\x9c\\x89\\xe9\\xa3\\x8e\\xe6\\x99\\xaf \\xe9\\x98\\x85\\xe8\\xaf\\xbb(13) \\xe8\\xaf\\x84\\xe8\\xae\\xba(0) <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9178745" rel="nofollow">\\xe7\\xbc\\x96\\xe8\\xbe\\x91</a></div>\\r\\n\\t\\t\\t<div class="clear"></div>\\r\\n\\t\\t\\r\\n</div>\\r\\n\\r\\n<div class="topicListFooter"><div id="nav_next_page"><a 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<b>19</b><br />\\n\' 5.589319705963135
（三）使用asyncio相关模块aiohttp（需要先安装，pip3即可）
asyncio支持的相关模块：
import asyncio,aiohttp async def fetch_async(url): print(url) async with aiohttp.request("GET",url) as r: reponse = await r.text(encoding="utf-8") #或者直接await r.read()不编码，直接读取，适合于图像等无法编码文件 print(reponse) tasks = [fetch_async(\'http://www.baidu.com/\'), fetch_async(\'http://www.chouti.com/\')] event_loop = asyncio.get_event_loop() results = event_loop.run_until_complete(asyncio.gather(*tasks)) event_loop.close()
（四）asyncio+requests,使用了事件循环中run_in_executor（创建了线程池去执行requests模块函数）
import asyncio import requests async def fetch_async(func, *args): loop = asyncio.get_event_loop() future = loop.run_in_executor(None, func, *args) #在内部创建了一个线程池，并以相同顺序返回结果 response = await future #等待线程执行结果返回后，才去获取 print(response.url, response.content) tasks = [ fetch_async(requests.get, \'http://www.cnblogs.com/ssyfj/\'), fetch_async(requests.get, \'https://www.cnblogs.com/ssyfj/p/9222342.html\') ] loop = asyncio.get_event_loop() results = loop.run_until_complete(asyncio.gather(*tasks)) loop.close()
源码：
开启线程池：
def run_in_executor(self, executor, func, *args): self._check_closed() if self._debug: self._check_callback(func, \'run_in_executor\') if executor is None: executor = self._default_executor if executor is None: executor = concurrent.futures.ThreadPoolExecutor() #创建线程池 self._default_executor = executor return futures.wrap_future(executor.submit(func, *args), loop=self) #线程池执行函数
调用线程安全处理协程对象call_soon_threadsafe。主线程处理事件循环，子线程处理任务。
response = await future #response是future对象，futures是异步并发模块
def __iter__(self): #可迭代，异步对象 if not self.done(): self._asyncio_future_blocking = True yield self # This tells Task to wait for completion. assert self.done(), "yield from wasn\'t used with future" return self.result() # May raise too.
（五）gevent+requests
import gevent,requests,time from gevent import monkey monkey.patch_all() #将socket变为异步 def fetch_async(url): reponse = requests.get(url) print(reponse.url,reponse.content) begin = time.time() gevent.joinall([ gevent.spawn(fetch_async("https://www.python.org/")), gevent.spawn(fetch_async("https://www.baidu.com/")), gevent.spawn(fetch_async("https://www.github.com/")), ]) end = time.time() print(end-begin)
gevent线程池
import gevent,time,requests from gevent.pool import Pool #协程池，一次最多数量限制 pool = Pool(10) def fetch_async(method, url, req_kwargs): print(method, url, req_kwargs) response = requests.request(method=method, url=url, **req_kwargs) print(response.url, response.content) begin = time.time() gevent.joinall([ pool.spawn(fetch_async, method=\'get\', url=\'https://www.python.org/\', req_kwargs={}), pool.spawn(fetch_async, method=\'get\', url=\'https://www.yahoo.com/\', req_kwargs={}), pool.spawn(fetch_async, method=\'get\', url=\'以上是关于python---爬虫相关性能（各个异步模块的使用，和自定义异步IO模块）的主要内容，如果未能解决你的问题，请参考以下文章