python - 此错误 : httperror_seek_wrapper: HTTP Error 404: Not Found? 的异常是什么

Question

我想处理错误:

“httperror_seek_wrapper:HTTP 错误 404:未找到”

而是只返回一个空字符串。但我不确定 except 语句应该是什么。如果有重复的帖子，我深表歉意，但弹出的帖子似乎都没有处理这个错误，而是在更深层次上找出出了什么问题。然而，我只想传递并返回一个空字符串。

基本上，我在寻找空白处应填入的内容:

try:
     ....
except _____:
     ....

谢谢!

_____

这是抛出错误的代码。

---------------------------------------------------------------------------
httperror_seek_wrapper                    Traceback (most recent call last)
<ipython-input-181-e2b68bf19ff9> in <module>()
      5 
      6 for i in range(len(first)):
----> 7     student_html = get_stud_html(first[i],last[i],'Sophomore')
      8 #     print type(student_html)
      9 #     print parse_hfb_page(student_html)

<ipython-input-177-9b1d4294820d> in get_stud_html(first, last, year)
     60     #ideally will want to use a regex to do this in case there's more than one link on the page
     61     stud_url = 'http://facebook.college.harvard.edu/'+links_lst[12]
---> 62     stud_html = br.open(stud_url)
     63     return stud_html.get_data()
     64 

//anaconda/python.app/Contents/lib/python2.7/site-packages/mechanize-0.2.5-py2.7.egg/mechanize/_mechanize.pyc in open(self, url, data, timeout)
    201     def open(self, url, data=None,
    202              timeout=_sockettimeout._GLOBAL_DEFAULT_TIMEOUT):
--> 203         return self._mech_open(url, data, timeout=timeout)
    204 
    205     def _mech_open(self, url, data=None, update_history=True, visit=None,

//anaconda/python.app/Contents/lib/python2.7/site-packages/mechanize-0.2.5-py2.7.egg/mechanize/_mechanize.pyc in _mech_open(self, url, data, update_history, visit, timeout)
    253 
    254         if not success:
--> 255             raise response
    256         return response
    257 

httperror_seek_wrapper: HTTP Error 404: Not Found

Answer 1

这是一个 urllib2.HTTPError 异常。

from urllib2 import HTTPError

try:
    # ...
except HTTPError:
    # ...

你可以在 source of _mechanize.py 中看到这个，其中捕获了相同的异常并将其分配给 response 以便稍后重新引发。