[Python-Dev] TextIO seek and tell cookies

[Peter Ludemann]

On 25 September 2016 at 21:18, Guido van Rossum <guido at python.org> wrote:

> Be careful though, comparing these to plain integers should probably
> be allowed,


​There's a good reason why it's "opaque" ... why would you want to make it
less opaque?

And I'm curious why Python didn't adopt the fgetpos/fsetpos style that
makes the data structure completely opaque (fpos_t). IIRC, this was added
to C when the ANSI standard was first written, to allow cross-platform
compatibility in cases where ftell/fseek was difficult (or impossible) to
fully implement. Maybe those reasons don't matter any more (e.g., dealing
with record-oriented or keyed file systems) ...



> and we also should make sure that things like
> serialization via JSON or storing in an SQL database don't break. I
> personally think it's one of those "learn not to touch the stove"
> cases and there's limited value in making this API idiot proof.
>
> On Sun, Sep 25, 2016 at 9:05 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
> > On 26 September 2016 at 10:21, MRAB <python at mrabarnett.plus.com> wrote:
> >> On 2016-09-26 00:21, Ben Leslie wrote:
> >>> Are there any downsides to this? I've made some progress developing a
> >>> patch to change this functionality. Is it worth polishing and
> >>> submitting?
> >>>
> >> An alternative might be a subclass of int.
> >
> > It could make sense to use a subclass of int that emitted deprecation
> > warnings for integer arithmetic, and then eventually disallowed it
> > entirely.
> >
> > Cheers,
> > Nick.
> >
> > --
> > Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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>
>
> --
> --Guido van Rossum (python.org/~guido)
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