[Python-Dev] urllib exception compatibility (original) (raw)

Guido van Rossum guido at python.org
Thu Sep 27 03:52:45 CEST 2007

Shouldn't these all inherit from EnvironmentError?

Or should EnvironmentError and IOError be the same thing perhaps?

--Guido

On 9/26/07, Jim Jewett <jimjjewett at gmail.com> wrote:

urllib goes to goes to some trouble to ensure that it raises IOError, even when the underlying exception comes from another module.[*] I'm wondering if it would make sense to just have those modules' exceptions inherit from IOError.

In particular, should socket.error, ftp.Error and httplib.HTTPException (used in Py3K) inherit from IOError? I'm also wondering whether it would be acceptable to change the details of the exceptions. For example, could raise IOError, ('ftp error', msg), sys.excinfo()[2] be reworded, or is there there too much risk that someone is checking for an "errno" of 'ftp error'?

[*] This isn't a heavily tested path; some actually fail with a TypeError since 2.5, because IOError no longer accepts argument tuples longer than 3. http://bugs.python.org/issue1209 Fortunately, this makes me less worried about changing the contents of the specific attributes to something more useful... -jJ

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-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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