基于 asyncio 的异步爬虫框架，有兴趣来看看

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