一：线程池，进程池等相关文章了解

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()),

    asyncio.ensure_future(func1()),

]

begin = time.time()

loop = asyncio.get_event_loop()

loop.run_until_complete(asyncio.gather(*tasks))

loop.close()

end = time.time()

print(end-begin)

 before func1.....

 before func1.....

 after func1......

 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,)

    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)

www.cnblogs.com /ssyfj/

www.baidu.com /

www.ckook.com /forum.php

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\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 \xe6\x97\xa0\xe6\xb3\x95\xe5\xae\x9e\xe7\x8e\xb0\xe4\xb8\xa4\xe4\xb8\xaa\xe5\x87\xbd\xe6\x95\xb0\xe4\xb9\x8b\xe9\x97\xb4\xe7\x9a\x84\xe4\xba\xa4\xe4\xba\x92\xe3\x80\x82 \xe5\xb0\x86\xe8\xbf\x99\xe4\xb8\xa4\xe4\xb8\xaa\xe5\x87\xbd\xe6\x95\xb0\xe8\xae\xbe\xe7\xbd\xae\xe4\xb8\xba\xe5\x8d\x8f\xe7\xa8\x8b\xef\xbc\x8c\xe5\x8a\xa0\xe4\xb8\x8aasync\xe5\x85\xb3\xe9\x94\xae\xe5\xad\x97 \xe9\x82\xa3\xe4\xb9\x88\xef\xbc\x8c\xe4\xb8\xba\xe4\xbb\x80\xe4\xb9\x88\xe8\xa6\x81\xe6\x9c\x89\xe4\xb8\x80\xe4\xb8\xaa\xe5\x8d\x8f\xe7\xa8\x8b\xe5\xaf\xb9\xe8\xb1\xa1\xef\xbc\x9f\xe4\xbb\xa3\xe7\xa0\x81\xe5\x88\xb0\xe5\xba\x95\xe5\xa6\x82\xe4\xbd\x95\xe6\x89\xa7\xe8\xa1\x8c\xef\xbc\x9f \xe5\x85\xb3\xe9\x94\xae\xe4\xb9\x8b\xe5\xa4\x84\xe6\x98\xaf\xe5\x8d\x8f\xe7\xa8\x8b\xe7\xa1\xae\xe5\xae\x9e\xe6\x98\xaf\xe4\xb8\x8e 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 \xe4\xbb\x8e\xe8\xaf\xad\xe6\xb3\x95\xe4\xb8\x8a\xe6\x9d\xa5\xe7\x9c\x8b\xef\xbc\x8c\xe5\x8d\x8f\xe7\xa8\x8b\xe5\x92\x8c\xe7\x94\x9f\xe6\x88\x90\xe5\x99\xa8\xe7\xb1\xbb\xe4\xbc\xbc\xef\xbc\x8c\xe9\x83\xbd\xe6\x98\xaf\xe5\xae\x9a\xe4\xb9\x89\xe4\xbd\x93\xe4\xb8\xad\xe5\x8c\x85\xe5\x90\xabyield\xe5\x85\xb3\xe9\x94\xae\xe5\xad\x97\xe7\x9a\x84\xe5\x87\xbd\xe6\x95\xb0\xe3\x80\x82yield\xe5\x9c\xa8\xe5\x8d\x8f\xe7\xa8\x8b\xe4\xb8\xad\xe7\x9a\x84\xe7\x94\xa8\xe6\xb3\x95\xef\xbc\x9a \xe5\x9c\xa8\xe5\x8d\x8f\xe7\xa8\x8b\xe4\xb8\xadyield\xe9\x80\x9a\xe5\xb8\xb8\xe5\x87\xba\xe7\x8e\xb0\xe5\x9c\xa8\xe8\xa1\xa8\xe8\xbe\xbe\xe5\xbc\x8f\xe7\x9a\x84\xe5\x8f\xb3\xe8\xbe\xb9\xef\xbc\x8c\xe4\xbe\x8b\xe5\xa6\x82\xef\xbc\x9adatum = yield,\xe5\x8f\xaf\xe4\xbb\xa5\xe4\xba\xa7\xe5\x87\xba\xe5\x80\xbc\xef\xbc\x8c\xe4\xb9\x9f\xe5\x8f\xaf\xe4\xbb\xa5<a href="https://www.cnblogs.com/ssyfj/p/9218730.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 20:09 \xe5\xb1\xb1\xe4\xb8\x8a\xe6\x9c\x89\xe9\xa3\x8e\xe6\x99\xaf \xe9\x98\x85\xe8\xaf\xbb(8) \xe8\xaf\x84\xe8\xae\xba(0)  <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9218730" 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_ctl02_ImageLink" href="//www.cnblogs.com/ssyfj/archive/2018/06/21.html">2018\xe5\xb9\xb46\xe6\x9c\x8821\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_ctl02_DayList_TitleUrl_0" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9210725.html">python---web\xe5\xbe\xae\xe4\xbf\xa1\xe5\xbc\x80\xe5\x8f\x91</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: \xe4\xb8\x80\xef\xbc\x9a\xe8\xbd\xae\xe8\xaf\xa2\xef\xbc\x8c\xe9\x95\xbf\xe8\xbd\xae\xe8\xaf\xa2\xef\xbc\x8cWebSocket\xe4\xba\x86\xe8\xa7\xa3 \xe8\xbd\xae\xe8\xaf\xa2\xef\xbc\x9a \xe9\x95\xbf\xe8\xbd\xae\xe8\xaf\xa2\xef\xbc\x9a WebSocket\xef\xbc\x9a \xe4\xba\x8c\xef\xbc\x9aweb\xe5\xbe\xae\xe4\xbf\xa1\xe6\xb5\x81\xe7\xa8\x8b\xe4\xbb\x8b\xe7\xbb\x8d \xe4\xb8\x89\xef\xbc\x9a\xe5\xbe\xae\xe4\xbf\xa1\xe7\x99\xbb\xe5\xbd\x95\xe5\xbc\x80\xe5\x8f\x91 \xe7\x99\xbb\xe5\xbd\x95\xe8\xa7\x86\xe5\x9b\xbelogin\xef\xbc\x8c\xe7\x94\xa8\xe4\xba\x8e\xe6\x98\xbe\xe7\xa4\xba\xe4\xba\x8c\xe7\xbb\xb4\xe7\xa0\x81 check_login\xe7\x94\xa8\xe4\xba\x8e\xe6\xa3\x80\xe6\xb5\x8b\xe7\x99\xbb\xe5\xbd\x95\xe7\x8a\xb6\xe6\x80\x81\xef\xbc\x9a408\xe6\x9c\xaa\xe6\x89\xab\xe6\x8f\x8f\xef\xbc\x8c201\xe6\x89\xab\xe6\x8f\x8f\xe4\xba\x8c\xe7\xbb\xb4\xe7\xa0\x81\xe4\xbd\x86\xe6\x98\xaf\xe6\x9c\xaa\xe7\x99\xbb\xe5\xbd\x95\xef\xbc\x8c200\xe7\x82\xb9\xe5\x87\xbb\xe7\x99\xbb\xe5\xbd\x95 ''' \xe6\x96\xb0\xe8\xaf\xb7\xe6\xb1\x82 GET \xe8\x8e\xb7\xe5\x8f\x96\xe8\xb7\xb3\xe8\xbd\xac\xe5\x9c\xb0\xe5\x9d\x80red<a href="https://www.cnblogs.com/ssyfj/p/9210725.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 @ 2018-06-21 23:33 \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=9210725" 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_ctl03_ImageLink" href="//www.cnblogs.com/ssyfj/archive/2018/06/19.html">2018\xe5\xb9\xb46\xe6\x9c\x8819\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_ctl03_DayList_TitleUrl_0" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9200602.html">python---requests\xe5\x92\x8cbeautifulsoup4\xe6\xa8\xa1\xe5\x9d\x97\xe7\x9a\x84\xe4\xbd\xbf\xe7\x94\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: Requests\xef\xbc\x9a\xe6\x98\xaf\xe4\xbd\xbf\xe7\x94\xa8 Apache2 Licensed \xe8\xae\xb8\xe5\x8f\xaf\xe8\xaf\x81\xe7\x9a\x84 \xe5\x9f\xba\xe4\xba\x8ePython\xe5\xbc\x80\xe5\x8f\x91\xe7\x9a\x84HTTP \xe5\xba\x93\xef\xbc\x8c\xe5\x85\xb6\xe5\x9c\xa8Python\xe5\x86\x85\xe7\xbd\xae\xe6\xa8\xa1\xe5\x9d\x97\xe7\x9a\x84\xe5\x9f\xba\xe7\xa1\x80\xe4\xb8\x8a\xe8\xbf\x9b\xe8\xa1\x8c\xe4\xba\x86\xe9\xab\x98\xe5\xba\xa6\xe7\x9a\x84\xe5\xb0\x81\xe8\xa3\x85\xef\xbc\x8c\xe4\xbb\x8e\xe8\x80\x8c\xe4\xbd\xbf\xe5\xbe\x97Pythoner\xe8\xbf\x9b\xe8\xa1\x8c\xe7\xbd\x91\xe7\xbb\x9c\xe8\xaf\xb7\xe6\xb1\x82\xe6\x97\xb6\xef\xbc\x8c\xe5\x8f\x98\xe5\xbe\x97\xe7\xbe\x8e\xe5\xa5\xbd\xe4\xba\x86\xe8\xae\xb8\xe5\xa4\x9a\xef\xbc\x8c\xe4\xbd\xbf\xe7\x94\xa8Requests\xe5\x8f\xaf\xe4\xbb\xa5\xe8\xbd\xbb\xe8\x80\x8c\xe6\x98\x93\xe4\xb8\xbe\xe7\x9a\x84\xe5\xae\x8c\xe6\x88\x90\xe6\xb5\x8f\xe8\xa7\x88\xe5\x99\xa8\xe5\x8f\xaf\xe6\x9c\x89\xe7\x9a\x84\xe4\xbb\xbb\xe4\xbd\x95\xe6\x93\x8d\xe4\xbd\x9c\xe3\x80\x82 BeautifulSoup<a href="https://www.cnblogs.com/ssyfj/p/9200602.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 @ 2018-06-19 18:42 \xe5\xb1\xb1\xe4\xb8\x8a\xe6\x9c\x89\xe9\xa3\x8e\xe6\x99\xaf \xe9\x98\x85\xe8\xaf\xbb(14) \xe8\xaf\x84\xe8\xae\xba(0)  <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9200602" 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_ctl03_DayList_TitleUrl_1" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9198020.html">python---RabbitMQ\xef\xbc\x885\xef\xbc\x89\xe6\xb6\x88\xe6\x81\xafRPC\xef\xbc\x88\xe8\xbf\x9c\xe7\xa8\x8b\xe8\xbf\x87\xe7\xa8\x8b\xe8\xb0\x83\xe7\x94\xa8\xef\xbc\x89</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\x9c\x8d\xe5\x8a\xa1\xe5\x99\xa8\xe7\xab\xaf\xef\xbc\x9a \xe5\xae\xa2\xe6\x88\xb7\xe7\xab\xaf\xef\xbc\x9a \xe6\xb3\xa8\xe6\x84\x8f\xef\xbc\x9a self.connection.process_data_events()\xe4\xbc\x9a\xe5\x8e\xbb\xe9\x98\x9f\xe5\x88\x97\xe4\xb8\xad\xe8\x8e\xb7\xe5\x8f\x96\xe5\xa4\x84\xe7\x90\x86\xe6\x95\xb0\xe6\x8d\xae\xe4\xba\x8b\xe4\xbb\xb6\xef\xbc\x8c\xe5\xbd\x93\xe6\x95\xb0\xe6\x8d\xae\xe6\x9d\xa5\xe4\xb8\xb4\xe7\x9a\x84\xe6\x97\xb6\xe5\x80\x99\xef\xbc\x8c\xe4\xbc\x9a\xe7\x9b\xb4\xe6\x8e\xa5\xe5\x8e\xbb\xe8\xb0\x83\xe7\x94\xa8\xe5\x9b\x9e\xe8\xb0\x83\xe5\x87\xbd\xe6\x95\xb0\xe5\x8e\xbb\xe5\xa4\x84\xe7\x90\x86\xe6\x95\xb0\xe6\x8d\xae<a href="https://www.cnblogs.com/ssyfj/p/9198020.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 @ 2018-06-19 12:22 \xe5\xb1\xb1\xe4\xb8\x8a\xe6\x9c\x89\xe9\xa3\x8e\xe6\x99\xaf \xe9\x98\x85\xe8\xaf\xbb(3) \xe8\xaf\x84\xe8\xae\xba(0)  <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9198020" 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_ctl04_ImageLink" href="//www.cnblogs.com/ssyfj/archive/2018/06/16.html">2018\xe5\xb9\xb46\xe6\x9c\x8816\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_ctl04_DayList_TitleUrl_0" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9191756.html">restful api</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: RESTful API \xe8\xae\xbe\xe8\xae\xa1\xe6\x8c\x87\xe5\x8d\x97 \xe7\x90\x86\xe8\xa7\xa3RESTful\xe6\x9e\xb6\xe6\x9e\x84 \xe7\x90\x86\xe8\xa7\xa3\xe6\x9c\xac\xe7\x9c\x9f\xe7\x9a\x84REST\xe6\x9e\xb6\xe6\x9e\x84\xe9\xa3\x8e\xe6\xa0\xbc Python \xe4\xb9\x8b\xe8\xb7\xaf\xef\xbc\x8cRestful API\xe8\xae\xbe\xe8\xae\xa1\xe8\xa7\x84\xe8\x8c\x83 python \xe4\xb9\x8b\xe8\xb7\xaf\xef\xbc\x8cDjango rest framework \xe5\x88\x9d\xe6\x8e\xa2 Django-rest-frameworl\xe7\x9a\x84\xe4\xbd\xbf\xe7\x94\xa8 1.djangorestframework<a href="https://www.cnblogs.com/ssyfj/p/9191756.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 @ 2018-06-16 23:26 \xe5\xb1\xb1\xe4\xb8\x8a\xe6\x9c\x89\xe9\xa3\x8e\xe6\x99\xaf \xe9\x98\x85\xe8\xaf\xbb(3) \xe8\xaf\x84\xe8\xae\xba(0)  <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9191756" 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_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 \xe7\xbd\x91\xe7\xab\x99\xef\xbc\x9ahttps://git-scm.com/download/win\xe4\xb8\x8b\xe8\xbd\xbd\xe5\xae\x89\xe8\xa3\x85\xe5\x8d\xb3\xe5\x8f\xaf \xef\xbc\x882\xef\xbc\x89linux\xe5\xae\x89\xe8\xa3\x85 2.\xe7\x89\x88\xe6\x9c\xac\xe5\xba\x93\xe5\x88\x9b\xe5\xbb\xba \xef\xbc\x881\xef\xbc\x89\xe5\x88\x9b\xe5\xbb\xba\xe9\xa1\xb9\xe7\x9b\xae\xe7\x9b\xae\xe5\xbd\x95 \xef\xbc\x882\xef\xbc\x89\xe7\x89\x88\xe6\x9c\xac\xe5\xba\x93\xe5\x88\x9b\xe5\xbb\xba \xef\xbc\x883\xef\xbc\x89\xe5\x88\x9b\xe5\xbb\xba\xe4\xb8\x80\xe4\xb8\xaa\xe6\x96\x87\xe4\xbb\xb6\xef\xbc\x8c\xe5\xb0\x86\xe6\x96\x87<a href="https://www.cnblogs.com/ssyfj/p/9189422.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 @ 2018-06-16 00:03 \xe5\xb1\xb1\xe4\xb8\x8a\xe6\x9c\x89\xe9\xa3\x8e\xe6\x99\xaf \xe9\x98\x85\xe8\xaf\xbb(3) \xe8\xaf\x84\xe8\xae\xba(0)  <a href ="https://i.cnblogs.com/EditPosts.aspx?postid=9189422" 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_ctl05_ImageLink" href="//www.cnblogs.com/ssyfj/archive/2018/06/13.html">2018\xe5\xb9\xb46\xe6\x9c\x8813\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_ctl05_DayList_TitleUrl_0" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9179587.html">linux\xe4\xb8\x8b\xe5\xae\x89\xe8\xa3\x85shellinabox\xe5\xae\x9e\xe7\x8e\xb0web\xe7\x99\xbb\xe5\xbd\x95\xe6\x9c\x8d\xe5\x8a\xa1\xe5\x99\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: GitHub\xe5\x9c\xb0\xe5\x9d\x80\xef\xbc\x88\xe5\x90\xab\xe6\x9c\x89\xe6\x96\x87\xe4\xbb\xb6\xe4\xb8\x8b\xe8\xbd\xbd\xe5\x92\x8c\xe8\xaf\xa6\xe7\xbb\x86\xe5\xae\x89\xe8\xa3\x85\xe6\xb5\x81\xe7\xa8\x8b\xef\xbc\x89\xef\xbc\x9ahttps://github.com/shellinabox/shellinabox \xe8\xbf\x99\xe9\x87\x8c\xe6\x88\x91\xe4\xbb\xac\xe4\xbd\xbf\xe7\x94\xa8\xe7\x9a\x84\xe6\x98\xafredhat\xe5\xae\x89\xe8\xa3\x85\xe6\x96\xb9\xe6\xb3\x95\xe5\xa6\x82\xe4\xb8\x8b\xef\xbc\x9a 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 ="https://i.cnblogs.com/EditPosts.aspx?postid=9179587" 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_ctl05_DayList_TitleUrl_1" class="postTitle2" href="https://www.cnblogs.com/ssyfj/p/9178745.html">linux\xe4\xb8\x8byum\xe9\x94\x99\xe8\xaf\xaf\xef\xbc\x9a[Errno 14] problem making ssl connection Trying other mirror.</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: \xe4\xbb\x8a\xe5\xa4\xa9\xe6\x98\xaf\xe8\xa6\x81yum\xe5\x91\xbd\xe4\xbb\xa4\xe5\xae\x89\xe8\xa3\x85EPEL\xe4\xbb\x93\xe5\xba\x93\xe5\x90\x8e \xe7\xaa\x81\xe7\x84\xb6\xe5\x8f\x91\xe7\x8e\xb0yum\xe5\xae\x89\xe8\xa3\x85\xe5\x85\xb6\xe4\xbb\x96\xe7\x9a\x84\xe8\xbd\xaf\xe4\xbb\xb6\xe5\x87\xba\xe9\x94\x99\xe3\x80\x82 \xe4\xba\x8e\xe6\x98\xaf\xe5\x8e\xbb\xe7\xbd\x91\xe4\xb8\x8a\xe6\x9f\xa5\xe4\xba\x86\xe6\x9f\xa5\xef\xbc\x8c\xe5\x8f\x91\xe7\x8e\xb0\xe8\xae\xb8\xe5\xa4\x9a\xe8\xa7\xa3\xe5\x86\xb3\xe6\x96\xb9\xe6\xb3\x95\xe3\x80\x82\xe4\xbc\xbc\xe4\xb9\x8e\xe6\x98\xafssl\xe8\xaf\x81\xe4\xb9\xa6\xe7\x9a\x84\xe5\x8e\x9f\xe5\x9b\xa0\xef\xbc\x8c\xe6\x9c\x80\xe7\xbb\x88\xe9\x80\x89\xe6\x8b\xa9 vim /etc/yum.repos.d/epel.repo \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 href="http://www.cnblogs.com/ssyfj/default.html?page=2">\xe4\xb8\x8b\xe4\xb8\x80\xe9\xa1\xb5</a></div></div>\r\n\r\n\r\n\t</div><!--end: forFlow 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www.ckook.com /forum.php b'HTTP/1.1 301 Moved Permanently\r\nDate: Sun, 24 Jun 2018 10:57:33 GMT\r\nServer: Apache/2.4.23 (Win32) OpenSSL/1.0.2j PHP/5.4.45\r\nX-Powered-By: PHP/5.4.45\r\nLocation: https://www.ckook.com/forum.php\r\nContent-Length: 133\r\nContent-Type: text/html\r\n\r\n<br />\n<b>Notice</b>:  Undefined index: HTTP_USER_AGENT in <b>C:\\www\\web\\www\\source\\class\\class_core.php</b> on line <b>19</b><br />\n'

5.589319705963135

输出

（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：

https://github.com/aio-libs

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='https://www.github.com/', req_kwargs={}),

])

end = time.time()

print(end-begin)

（六）grequests===>gevent+request是对上面的结合使用

import grequests

request_list = [

    grequests.get('https://www.python.org/'),

    grequests.get('https://www.yahoo.com/'),

    grequests.get('https://www.github.com/'),

]

reponse_list = grequests.map(request_list)

print(reponse_list)

（七）twisted的使用

推文：网络框架twisted

from twisted.internet import defer

from twisted.web.client import getPage

from twisted.internet import reactor

def one_done(arg):

    print(arg)

def all_done(arg):

    print("all done")

    reactor.stop()

@defer.inlineCallbacks

def task(url):

    res = getPage(bytes(url,encoding="utf-8"))  #获取页面，发送http请求,是使用select池将所有socket请求保存，依据此进行计数。

    print('',type(res))　　　　#<class 'twisted.internet.defer.Deferred'>

    res.addCallback(one_done)   #对每一个请求都添加一个回调方法

    yield res   #返回他

start_url_list = [

    'http://www.baidu.com',

    'http://www.github.com',

]

defer_list = []

for url in start_url_list:

    v = task(url)   #发送请求后立即返回，不等待返回，v是一个特殊对象，标志你发送到那个请求

    print(v,type(v))

    defer_list.append(v)

d = defer.DeferredList(defer_list)  #将上面的特殊对象列表一起放入DeferredList

d.addBoth(all_done)　　#为所有对象添加回调

reactor.run()　　#会一直循环，我们需要在任务执行完毕后关闭。含有计数器，执行一个任务，会执行一次one_done,计数减一。单任务执行完毕，计数为0，执行all_done

（八）tornado的使用

from tornado.httpclient import AsyncHTTPClient

from tornado.httpclient import HTTPRequest

from tornado import ioloop

COUNT = 

def handle_response(response):

    """

    处理返回值内容（需要维护计数器，来停止IO循环），调用 ioloop.IOLoop.current().stop()

    :param response:

    :return:

    """

    global COUNT

    COUNT -=

    if response.error:

        print("Error:", response.error)

    else:

        print(response.body)

    if COUNT == :

        ioloop.IOLoop.current().stop()

def func():

    url_list = [

        'http://www.baidu.com',

        'http://www.bing.com',

    ]

    global COUNT

    COUNT = len(url_list)

    for url in url_list:

        print(url)

        http_client = AsyncHTTPClient()

        http_client.fetch(HTTPRequest(url), handle_response)

ioloop.IOLoop.current().add_callback(func)

ioloop.IOLoop.current().start()

选用原则：gevent>twisted>tornado>asyncio

三：自定义异步IO模块开发

# coding:utf8

# __author:  Administrator

# date:      //

# /usr/bin/env python

import socket

import select

class HttpRequest:

    def __init__(self,sk,host,callback):

        self.socket = sk

        self.host= host

        self.callback = callback

    def fileno(self):　　#select需要的是文件描述符，传递的数据对象，必须含有fileno方法，返回文件描述符

        return self.socket.fileno()

class HttpResponse:

    def __init__(self,recv_data):

        self.recv_data = recv_data

        self.header_dict = {}

        self.body = None

        self.initialize()

    def initialize(self):

        #先分割请求头

        headers,body = self.recv_data.split(b'\r\n\r\n',)

        #在分割各个请求头数据

        header_list = headers.split(b"\r\n")

        for hd in header_list:

            hd_str = str(hd,encoding="utf-8")

            item = hd_str.split(":")

            if len(item) == :

                self.header_dict[item[]]=item[]

        self.body = str(body,encoding="utf-8")

class AsyncRequest():

    def __init__(self):

        self.read_list = []

        self.write_list = []

        self.error_list = []

    def create_task(self,task):

        try:

            sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

            sk.setblocking(False)

            sk.connect((task['host'], ,))

        except BlockingIOError as e:

            pass

        request = HttpRequest(sk,task['host'],task['callback'])

        self.read_list.append(request)

        self.write_list.append(request)

    def run(self):

        while True:

            r_list,w_list,e_list = select.select(self.read_list,self.write_list,self.error_list)

            for w in w_list:    #向网站发送请求头，开始获取资源

                print(w.host,"连接成功...")

                tpl = "GET / HTTP/1.0\r\nHost:%s\r\n\r\n"%(w.host,)

                w.socket.send(bytes(tpl,encoding="utf-8"))

                self.write_list.remove(w)

            for r in r_list:

                print(r.host,"开始采集资源...")

                recv_data = bytes()

                while True:

                    try:

                        chunck = r.socket.recv()

                        recv_data += chunck

                    except BlockingIOError as e:  #当数据为空，且不是由于阻塞抛出异常时，才是完成数据采集

                        continue

                    else:

                        if not chunck:

                            break

                #采集结束，封装数据，开始回调操作

                reponse = HttpResponse(recv_data)

                r.callback(reponse)

                r.socket.close()

                self.read_list.remove(r)

            #所有数据采集完成，退出

            if len(self.read_list) == 0:

                break

def f1(reponse):

    print("f1",reponse.header_dict)

def f2(reponse):

    print("f2",reponse.header_dict)

def f3(reponse):

    print("f3",reponse.header_dict)

url_list = [

    {"host":'www.baidu.com',"callback":f1},

    {'host':'cn.bing.com',"callback":f2},

    {'host':'www.cctv.com',"callback":f3}

]

AsynReq = AsyncRequest()

for url in url_list:

    AsynReq.create_task(url)

AsynReq.run()

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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）

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

（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：

使用asyncio实现requests请求获取资源

（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：

（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）

源码：

开启线程池：

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

（五）gevent+requests

gevent线程池

（六）grequests===>gevent+request是对上面的结合使用

（七）twisted的使用

（八）tornado的使用

选用原则：gevent>twisted>tornado>asyncio

三：自定义异步IO模块开发

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）的更多相关文章

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热门专题

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）

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

（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：

使用asyncio实现requests请求获取资源

（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：

（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）

源码：

开启线程池：

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

（五）gevent+requests

gevent线程池

（六）grequests===>gevent+request是对上面的结合使用

（七）twisted的使用

（八）tornado的使用

选用原则：gevent>twisted>tornado>asyncio

三：自定义异步IO模块开发

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）的更多相关文章

随机推荐

热门专题

response = await future　　#response是future对象，futures是异步并发模块