Python异步爬取知乎热榜实例分享
目录
一、错误代码：摘要和详细的url获取不到
二、查看JS代码
一、错误代码：摘要和详细的url获取不到import asyncio
from bs4 import BeautifulSoup
import 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()
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 asyncio
import json
import re
import 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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