[Python-Dev] IO module precisions and exception hierarchy

[Michael Foord]

Greg Ewing wrote:
> Michael Foord wrote:
>
>> Well, the file type knows what mode it is opened in so catching these 
>> errors is really not difficult at all.
>
> Yes, in this particular case it could do some checking of
> its own before making the system call. But this still has
> nothing to do with the exception hierarchy.
>
You said that having an exception hierarchy was impossible because the 
only information we have is the error number. Some errors could easily 
be caught.

Michael

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