[Python-Dev] IO module precisions and exception hierarchy (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Mon Sep 28 00:38:31 CEST 2009

Le Mon, 28 Sep 2009 06:41:17 +1000, Nick Coghlan a écrit :

Not as such - a big exception hierarchy rewrite was rejected, but nothing specifically limited to the IO exceptions. Michael's response cut to the heart of the issue though - a richer IO exception hierarchy can make life interesting for compatibility purposes (especially when creating "file-like" interfaces to non-file objects).

Well, not more interesting than currently where you need to replicate errno numbers if you want to make the errors precise enough, since an API consumer wanting to check specific error conditions will discriminate on errno.

If you don't want to go to that level of perfection, you just have to raise a plain IOError (or OSError :-)) without bothering about errno or subclasses; like you would do today.

Regards

Antoine.

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