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python file API

Oscar Benjamin oscar.j.benjamin at gmail.com
Mon Sep 24 18:55:59 EDT 2012 
 On 24 September 2012 23:41, Mark Adam <dreamingforward at gmail.com> wrote:

> > seek() and tell() can raise exceptions on some files. Exposing pos as an
> > attribute and allowing it to be manipulated with attribute access gives
> the
> > impression that it is always meaningful to do so.
>
> It's a good point, python already is allowing exceptions to be caught
> within "properties",  so exceptions from such an attribute could
> presumably be handled similarly.
>

There are many situations where a little bit of attribute access magic is a
good thing. However, operations that involve the underlying OS and that are
prone to raising exceptions even in bug free code should not be performed
implicitly like this. I find the following a little cryptic:
try:
    f.pos = 256
except IOError:
    print('Unseekable file')

Oscar
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