这些错误是什么，我该如何处理？答案

【问题标题】：What are these errors and how do I handle them?这些错误是什么，我该如何处理？
【发布时间】：2009-11-30 04:16:14
【问题描述】：

我正在使用这个简单的代码

for l in bios:
    OpenThisLink = url + l
    response = urllib2.urlopen(OpenThisLink)

打开大约 200 个 url 并使用正则表达式（和 BeautifulSoup）搜索它们，但经过十几个左右我得到这些错误并且 IDLE 退出。他们的意思是什么？我该如何处理它们？

谢谢。

Traceback (most recent call last):

  File "\PROJECTS\JD\jd10.py", line 15, in <module> response = urllib2.urlopen(OpenThisLink)

  File "C:\Python26\lib\urllib2.py", line 124, in urlopen return _opener.open(url, data, timeout)

  File "C:\Python26\lib\urllib2.py", line 389, in open response = meth(req, response)

  File "C:\Python26\lib\urllib2.py", line 502, in http_response 'http', request, response, code, msg, hdrs)

  File "C:\Python26\lib\urllib2.py", line 421, in error result = self._call_chain(*args)

  File "C:\Python26\lib\urllib2.py", line 361, in _call_chain result = func(*args)

  File "C:\Python26\lib\urllib2.py", line 597, in http_error_302 return self.parent.open(new)

  File "C:\Python26\lib\urllib2.py", line 389, in open response = meth(req, response)

  File "C:\Python26\lib\urllib2.py", line 502, in http_response 'http', request, response, code, msg, hdrs)

  File "C:\Python26\lib\urllib2.py", line 421, in error result = self._call_chain(*args)

  File "C:\Python26\lib\urllib2.py", line 361, in _call_chain result = func(*args)

  File "C:\Python26\lib\urllib2.py", line 597, in http_error_302 return self.parent.open(new)

  File "C:\Python26\lib\urllib2.py", line 389, in open response = meth(req, response)

  File "C:\Python26\lib\urllib2.py", line 502, in http_response 'http', request, response, code, msg, hdrs)

  File "C:\Python26\lib\urllib2.py", line 427, in error return self._call_chain(*args)

  File "C:\Python26\lib\urllib2.py", line 361, in _call_chain result = func(*args)

  File "C:\Python26\lib\urllib2.py", line 510, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) HTTPError: HTTP Error 404: Not Found

【问题讨论】：

标签： python beautifulsoup

【解决方案1】：

引发的错误是 HTTPError - 具体来说，您的其中一个 URL 会引发 404。你可以忽略它：

for l in bios:
    OpenThisLink = url + l
    try:
        response = urllib2.urlopen(OpenThisLink)
    except urllib2.HTTPError:
        pass

或者，您可以使用（略微）更有意义的消息重新引发错误：

for l in bios:
    OpenThisLink = url + l
    try:
        response = urllib2.urlopen(OpenThisLink)
    except urllib2.HTTPError as e:
        raise Exception('Error opening %s: %s' % (e.geturl(), e))

【讨论】：

【解决方案2】：

我对您正在使用的特定库一无所知。但是，在我看来，这就像一个大的堆栈跟踪，最终导致了这个原始错误：

HTTPError：HTTP 错误 404：未找到

我认为其中一个链接不正确，触发了未捕获的异常。

编辑：“坏”是指服务器无法检索页面，因此出现 404 错误。

【讨论】：