Python 3 Web Scraping中的HTTP错误403

问题描述

我试图废弃网站进行练习，但我一直在收到HTTP错误403（它认为我是机器人）吗？

I was trying to scrap a website for practice, but I kept on getting the HTTP Error 403 (does it think I'm a bot)?

这是我的代码：

#import requests
import urllib.request
from bs4 import BeautifulSoup
#from urllib import urlopen
import re

webpage = urllib.request.urlopen('http://www.cmegroup.com/trading/products/#sortField=oi&sortAsc=false&venues=3&page=1&cleared=1&group=1').read
findrows = re.compile('<tr class="- banding(?:On|Off)>(.*?)</tr>')
findlink = re.compile('<a href =">(.*)</a>')

row_array = re.findall(findrows, webpage)
links = re.finall(findlink, webpate)

print(len(row_array))

iterator = []

我得到的错误是：

 File "C:\Python33\lib\urllib\request.py", line 160, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Python33\lib\urllib\request.py", line 479, in open
    response = meth(req, response)
  File "C:\Python33\lib\urllib\request.py", line 591, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Python33\lib\urllib\request.py", line 517, in error
    return self._call_chain(*args)
  File "C:\Python33\lib\urllib\request.py", line 451, in _call_chain
    result = func(*args)
  File "C:\Python33\lib\urllib\request.py", line 599, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

推荐答案

这可能是因为 mod_security 或某些类似的服务器安全功能阻止已知的spider / bot用户代理（ urllib 使用类似的东西 python urllib / 3.3.0 ，很容易被发现）。尝试使用以下方式设置已知的浏览器用户代理：

This is probably because of mod_security or some similar server security feature which blocks known spider/bot user agents (urllib uses something like python urllib/3.3.0, it's easily detected). Try setting a known browser user agent with:

from urllib.request import Request, urlopen

req = Request('http://www.cmegroup.com/trading/products/#sortField=oi&sortAsc=false&venues=3&page=1&cleared=1&group=1', headers={'User-Agent': 'Mozilla/5.0'})
webpage = urlopen(req).read()

这对我有用。

顺便说一下，在你的代码中，你错过了（）之后 .read 在 urlopen 行中，但我认为这是一个错字。

By the way, in your code you are missing the () after .read in the urlopen line, but I think that it's a typo.

提示：由于这是练习，因此请选择其他非限制性网站。也许他们出于某种原因阻止 urllib ...

TIP: since this is exercise, choose a different, non restrictive site. Maybe they are blocking urllib for some reason...

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