[Python-Dev] urllib exception compatibility

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?


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.exc_info()[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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