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Groups > comp.lang.python > #12525

Re: try... except with unknown error types

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In article <mailman.286.1313956388.27778.python-list@python.org>,
Terry Reedy  <tjreedy@udel.edu> wrote:
>I would expect that catching socket.error (or even IOError) should catch 
>all of those.
>
>"exception socket.error
>A subclass of IOError ...

Except that, as Steven D'Aprano almost noted elsethread, it isn't
(a subclass of IOError -- the note was that it is not a subclass
of EnvironmentError).  In 2.x anyway:

    >>> import socket
    >>> isinstance(socket.error, IOError)
    False
    >>> isinstance(socket.error, EnvironmentError)
    False
    >>> 

(I just catch socket.error directly for this case.)

(I have also never been sure whether something is going to raise
an IOError or an OSError for various OS-related read or write
operation failures -- such as exceeding a resource limit, for
instance -- so most places that do I/O operations on OS files, I
catch both.  Still, it sure would be nice to have a static analysis
tool that could answer questions about potential exceptions. :-) )
-- 
In-Real-Life: Chris Torek, Wind River Systems
Intel require I note that my opinions are not those of WRS or Intel
Salt Lake City, UT, USA (40°39.22'N, 111°50.29'W)  +1 801 277 2603
email: gmail (figure it out)      http://web.torek.net/torek/index.html

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Thread

try... except with unknown error types Yingjie Lin <Yingjie.Lin@mssm.edu> - 2011-08-19 15:09 -0400
  Re: try... except with unknown error types John Gordon <gordon@panix.com> - 2011-08-19 19:14 +0000
    Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-20 06:13 +1000
      Re: try... except with unknown error types John Gordon <gordon@panix.com> - 2011-08-19 20:24 +0000
        Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-20 06:45 +1000
          Re: try... except with unknown error types Seebs <usenet-nospam@seebs.net> - 2011-08-20 05:46 +0000
        Re: try... except with unknown error types John Nagle <nagle@animats.com> - 2011-08-20 13:15 -0700
      Re: try... except with unknown error types Paul Rubin <no.email@nospam.invalid> - 2011-08-20 12:18 -0700
        Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-21 06:14 +1000
          Re: try... except with unknown error types Paul Rubin <no.email@nospam.invalid> - 2011-08-21 11:26 -0700
            Re: try... except with unknown error types Chris Angelico <rosuav@gmail.com> - 2011-08-21 20:17 +0100
              Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 10:30 +1000
                Re: try... except with unknown error types Chris Angelico <rosuav@gmail.com> - 2011-08-22 01:41 +0100
                Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 14:01 +1000
                Re: try... except with unknown error types Paul Rubin <no.email@nospam.invalid> - 2011-08-23 00:21 -0700
                Re: try... except with unknown error types Chris Angelico <rosuav@gmail.com> - 2011-08-23 09:26 +0100
                Re: try... except with unknown error types gene heskett <gheskett@wdtv.com> - 2011-08-23 04:43 -0400
                Re: try... except with unknown error types Paul Rubin <no.email@nospam.invalid> - 2011-08-23 10:43 -0700
                Re: try... except with unknown error types Chris Angelico <rosuav@gmail.com> - 2011-08-23 10:07 +0100
                Re: try... except with unknown error types John Nagle <nagle@animats.com> - 2011-08-31 21:22 -0700
            Re: try... except with unknown error types Ethan Furman <ethan@stoneleaf.us> - 2011-08-21 12:22 -0700
            Re: try... except with unknown error types Terry Reedy <tjreedy@udel.edu> - 2011-08-21 15:52 -0400
              Re: try... except with unknown error types Chris Torek <nospam@torek.net> - 2011-08-31 21:01 +0000
                Re: try... except with unknown error types Stefan Krah <stefan-usenet@bytereef.org> - 2011-09-09 23:41 +0200
                Re: try... except with unknown error types Nobody <nobody@nowhere.com> - 2011-09-10 10:33 +0100
                Re: try... except with unknown error types Peter Otten <__peter__@web.de> - 2011-09-10 12:17 +0200
            Re: try... except with unknown error types Roy Smith <roy@panix.com> - 2011-08-21 17:14 -0400
            Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 10:25 +1000
              Re: try... except with unknown error types Roy Smith <roy@panix.com> - 2011-08-21 22:09 -0400
            Re: try... except with unknown error types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-23 18:33 +1000

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