基于 asyncio 的异步爬虫框架，有兴趣来看看

[xiaozizayang]

轻量异步爬虫框架 aspider ，基于 asyncio

介绍

对于单页面，只要实现框架定义的 Item 就好：

import asyncio

from aspider import AttrField, TextField, Item


class HackerNewsItem(Item):
    target_item = TextField(css_select='tr.athing')
    title = TextField(css_select='a.storylink')
    url = AttrField(css_select='a.storylink', attr='href')

    async def clean_title(self, value):
        return value


items = asyncio.get_event_loop().run_until_complete(HackerNewsItem.get_items(url="https://news.ycombinator.com/"))
for item in items:
    print(item.title, item.url)

Notorious ‘ Hijack Factory ’ Shunned from Web https://krebsonsecurity.com/2018/07/notorious-hijack-factory-shunned-from-web/
 ......

对于多页面的网站，使用 Spider 即可：

import aiofiles

from aspider import AttrField, TextField, Item, Spider


class HackerNewsItem(Item):
    target_item = TextField(css_select='tr.athing')
    title = TextField(css_select='a.storylink')
    url = AttrField(css_select='a.storylink', attr='href')

    async def clean_title(self, value):
        return value


class HackerNewsSpider(Spider):
    start_urls = ['https://news.ycombinator.com/', 'https://news.ycombinator.com/news?p=2']

    async def parse(self, res):
        items = await HackerNewsItem.get_items(html=res.html)
        for item in items:
            async with aiofiles.open('./hacker_news.txt', 'a') as f:
                await f.write(item.title + '\n')


if __name__ == '__main__':
    HackerNewsSpider.start()

[2018-07-11 17:50:12,430]-aspider-INFO  Spider started!
[2018-07-11 17:50:12,430]-Request-INFO  <GET: https://news.ycombinator.com/>
[2018-07-11 17:50:12,456]-Request-INFO  <GET: https://news.ycombinator.com/news?p=2>
[2018-07-11 17:50:14,785]-aspider-INFO  Time usage: 0:00:02.355062
[2018-07-11 17:50:14,785]-aspider-INFO  Spider finished!

同样支持 js 加载：

request = Request("https://www.jianshu.com/", load_js=True)
response = asyncio.get_event_loop().run_until_complete(request.fetch())
print(response.body)

在 Item 以及 Spider 中要是想加载 js，同样只要带上 load_js=True 即可

项目 Github 地址：aspider

[jy02201949]

支持 js 加载啊，看起来屌屌的

[lixuda]

收藏下哈

[d0m2o08]

已 star

[xiaozizayang]

@d0m2o08 哈哈谢谢

[xiaozizayang]

@lixuda 谢~

[smh2208]

已 star, 希望能讲下做一个这样的框架的实现思路是怎样的，想学习一下如何写框架

[xiaozizayang]

@smh2208 有兴趣可以看看源码一起开发

[aneureka]

楼主有开个讨论群吗☺

[xiaozizayang]

@aneureka 有问题可邮件或者 issue

[hzm0318hzm]

最近在学 py，有空看看先 star 了

[xiaozizayang]

@hzm0318hzm 共同学习

[sugarguo]

提个小 bug

文档里面的 spider 部分，res 没有 html，那个应该是 body，example 里面是对的

[xiaozizayang]

@sugarguo 已经改了 感谢

[beforeuwait]

能支持 js，这个屌屌哒

[kuokyong]

有兴趣可以看我的项目。https://github.com/kkyon/botflow
封装了 asyncio 细节。
Botflow is a Python Fast Data driven programming framework for Data pipeline work( Web Crawler,Machine Learning,Quantitative Trading.etc) http://docs.botflow.org/

[smh2208]

@xiaozizayang 好的

[xiaozizayang]

@kuokyong 好的大佬 我看看

[zeromake]

为啥我看代码排版是坨屎啊，不扯淡了，我工作还没找到合适的呢，你啥时候准备从那个公司溜啊。

[hwywhywl]

@xiaozizayang window 平台下报错
Traceback (most recent call last):
File "weibospider.py", line 26, in <module>
HackerNewsSpider.start()
File "C:\Users\hwywhywl\StudioProjects\weibo_splider\lib\site-packages\aspider\spider.py", line 92, in start
spider_ins.loop.add_signal_handler(_signal, lambda: asyncio.ensure_future(spider_ins.stop(_signal)))
File "C:\Users\hwywhywl\Anaconda3\lib\asyncio\events.py", line 499, in add_signal_handler
raise NotImplementedError
NotImplementedError

ioloop.add_signal_handler 在 window 下不支持，判断一下吧

[xiaozizayang]

@hwywhywl 收到 谢谢 我来修复哈