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Thu Apr 2 22:44:09 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-April/088089.html

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On Apr 2, 2009, at 3:35 PM, Jack diederich wrote:

> On Thu, Apr 2, 2009 at 4:25 PM, Benjamin Peterson  
> <benjamin at python.org> wrote:
>> 2009/4/2 Gustavo Carneiro <gjcarneiro at gmail.com>:
>>> Apologies if this has already been discussed.
>>
>> I don't believe it has ever been discussed to be implemented.
>>
>>> Apparently no one has bothered yet to turn OSError + errno into a  
>>> hierarchy
>>> of OSError subclasses, as it should.  What's the problem, no will  
>>> to do it,
>>> or no manpower?
>>
>> Python doesn't need any more builtin exceptions to clutter the
>> namespace. Besides, what's wrong with just checking the errno?
>
> The problem is manpower (this has been no ones itch).  In order to
> have a hierarchy of OSError exceptions the underlying code would have
> to raise them.  That means diving into all the C code that raises
> OSError and cleaning them up.
>
> I'm +1 on the idea but -1 on doing the work myself.

I'm +0/-1 (idea/work) on doing them all, but I think a /few/ errnos  
would be very handy.  I certainly check ENOENT and EEXIST very  
frequently, so being able to easily catch or ignore those would be a  
big win.  I'm sure there's one or two others that would give big bang  
for little buck.

Barry

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[Python-Dev] OSError.errno => exception hierarchy?