catch specific HTTP error in python

Question

I want to catch a specific http error and not any one of the entire family   what I was trying to do is --  import urllib2 try     urllib2 urlopen  some url   except urllib2 HTTPError      lt whatever gt    but what I end up is catching any kind of http error  but I want to catch only if the specified webpage doesn t exist   probably that s HTTP error 404  but I don t know how to specify that catch only error 404 and let the system run the default handler for other events  ny suggestions

User · Answer

Tims answer seems to me as misleading  Especially when urllib2 does not return expected code  For example this Error will be fatal  believe or not - it is not uncommon one when downloading urls       AttributeError   URLError  object has no attribute  code    Fast  but maybe not the best solution would be code using nested try except block    import urllib2 try      urllib2 urlopen  some url   except urllib2 HTTPError  err      try          if err code    404                Handle the error         else              raise     except                More information to the topic of nested try except blocks Are nested try except blocks in python a good programming practice

User · Answer

Python 3  from urllib error import HTTPError   Python 2  from urllib2 import HTTPError   Just catch HTTPError  handle it  and if it s not Error 404  simply use raise to re-raise the exception    See the Python tutorial   e g  complete example for Pyhton 2  import urllib2 from urllib2 import HTTPError try     urllib2 urlopen  some url   except HTTPError as err     if err code    404          lt whatever gt     else         raise

User · Answer

For Python 3 x  import urllib request from urllib error import HTTPError try      urllib request urlretrieve url  fullpath  except urllib error HTTPError as err      print err code

[python] catch specific HTTP error in python

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