Python异步爬取知乎热榜的方法

今天小编给大家分享一下Python异步爬取知乎热榜的方法的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

一、错误代码：摘要和详细的url获取不到

import asynciofrom bs4 import BeautifulSoupimport aiohttp headers={    'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',    'referer': 'https://www.baidu.com/s?tn=02003390_43_hao_pg&isource=infinity&iname=baidu&itype=web&ie=utf-8&wd=%E7%9F%A5%E4%B9%8E%E7%83%AD%E6%A6%9C'}async def getPages(url):    async with aiohttp.ClientSession(headers=headers) as session:        async with session.get(url) as resp:            print(resp.status)  # 打印状态码            html=await resp.text()    soup=BeautifulSoup(html,'lxml')    items=soup.select('.HotList-item')    for item in items:        title=item.select('.HotList-itemTitle')[0].text        try:            abstract=item.select('.HotList-itemExcerpt')[0].text        except:            abstract='No Abstract'        hot=item.select('.HotList-itemMetrics')[0].text        try:            img=item.select('.HotList-itemImgContainer img')['src']        except:            img='No Img'        print("{}\n{}\n{}".format(title,abstract,img)) if __name__ == '__main__':    url='https://www.zhihu.com/billboard'    loop=asyncio.get_event_loop()    loop.run_until_complete(getPages(url))    loop.close()

二、查看JS代码

发现详细链接、图片链接、问题摘要等都在JS里面（CSDN的开发者助手插件确实好用）

正则表达式获取上述信息:

接下来就是详细的代码啦

import asyncioimport jsonimport reimport aiohttp headers={    'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',    'referer': 'https://www.baidu.com/s?tn=02003390_43_hao_pg&isource=infinity&iname=baidu&itype=web&ie=utf-8&wd=%E7%9F%A5%E4%B9%8E%E7%83%AD%E6%A6%9C'}async def getPages(url):    async with aiohttp.ClientSession(headers=headers) as session:        async with session.get(url) as resp:            print(resp.status)  # 打印状态码            html=await resp.text()     regex=re.compile('"hotList":(.*?),"guestFeeds":')    text=regex.search(html).group(1)    # print(json.loads(text))   # json换成字典格式    for item in json.loads(text):        title=item['target']['titleArea']['text']        question=item['target']['excerptArea']['text']        hot=item['target']['metricsArea']['text']        link=item['target']['link']['url']        img=item['target']['imageArea']['url']        if not img:            img='No Img'        if not question:            question='No Abstract'        print("Title：{}\nPopular：{}\nQuestion：{}\nLink：{}\nImg：{}".format(title,hot,question,link,img)) if __name__ == '__main__':    url='https://www.zhihu.com/billboard'    loop=asyncio.get_event_loop()    loop.run_until_complete(getPages(url))    loop.close()

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