[Python-Dev] PEP 455: TransformDict

[Antoine Pitrou]

On Sat, 14 Sep 2013 22:07:50 +0300
Serhiy Storchaka <storchaka at gmail.com> wrote:
> 14.09.13 20:41, Antoine Pitrou написав(ла):
> > On Sat, 14 Sep 2013 09:43:13 -0700
> > Ethan Furman <ethan at stoneleaf.us> wrote:
> >> Still, I think it would be useful to expose the transform function.
> >> Any good reason not to?
> >
> > No good reason. What's the name? transform_func?
> 
> There is one reason -- serialization. For example pickle saves the 
> transform function as an argument for TransformDict constructor. Repr 
> exposes the transform function too (in evaluable representation). Other 
> serializers need the transform function too. My implementations expose 
> it as public property (transform), your -- as private attribute 
> (_transform).
> 
> Or perhaps I misunderstood you?

"No good reason" not to expose it. It was a double negation, sorry ;-)

Regards

Antoine.