[Python-ideas] Function composition (was no subject)

[Ivan Levkivskyi]

> On Thu, May 7, 2015 at 7:09 PM, Jo?o Santos <jmcs at jsantos.eu> wrote:
> > On Wed, 6 May 2015 at 16:51 Steven D'Aprano <steve at pearwood.info> wrote:
> >>
> >>
> >> I think that there are some questions that would need to be answered.
> >> For instance, given some composition:
> >>
> >>     f = math.sin @ (lambda x: x**2)
> >>
> >> what would f.__name__ return? What about str(f)?
> >
> >
> > Lambdas return '<lambda>' so maybe something like '<composed>'?
> > Then str(f) would be '<function <composed> at 0xffffffffffff>'.
>
> Would be nice to use "<sin @ <lambda>>", incorporating both names, but
> that could get unwieldy once you compose a bunch of functions.

Maybe it would be better to have '<function <composed> at 0xffffffffffff>'
for str(f) but 'sin @ <lambda>' for repr (f). So that one can have more
info and it would be closer to idealistic obj == eval (repr (obj)).
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