[Python-Dev] IO module precisions and exception hierarchy
greg.ewing at canterbury.ac.nz
Sun Sep 27 13:16:38 CEST 2009
Pascal Chambon wrote:
> -> it seems that the only important matter is : file pointer positions
> and bytes/characters read should always be the ones that the user
> expects, as if there were no buffering.
That sounds right to me.
> Q from me : What happens in read/write text files, when overwriting a
> three-bytes character with a single-byte character ?
I think you deserve whatever you get. If you want to be able
to overwrite things that accurately, you should be dealing
with the stream at the byte level.
> Here is a very rough beginning of IOError hierarchy.
> +-InvalidFileNameError (filepath max lengths, or "? / : " characters in
> a windows file name...)
This might be a bit too precise. Unix just has EINVAL, which
covers any kind of invalid parameter, not just file names.
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