[Python-ideas] Augmented assignment syntax for objects.

[Tin Tvrtković]

You might want to check out attrs (http://attrs.readthedocs.io/en/stable/).
It can generate the __init__ for you, and much much more.


Date: Tue, 25 Apr 2017 14:33:49 +0200
> From: George Fischhof <george at fischhof.hu>
> To: Paul Moore <p.f.moore at gmail.com>
> Cc: Python-Ideas <python-ideas at python.org>, "Steven D'Aprano"
>         <steve at pearwood.info>
> Subject: Re: [Python-ideas] Augmented assignment syntax for objects.
> Message-ID:
>         <
> CAFwcP0gjg1BXeQ2pmv637bXG6+vcXiVu1QNEkdetuHjmoT_yCw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 2017. ?pr. 25. de. 10:04 ezt ?rta ("Paul Moore" <p.f.moore at gmail.com>):
>
> On 25 April 2017 at 03:53, Steven D'Aprano <steve at pearwood.info> wrote:
> > On Tue, Apr 25, 2017 at 02:08:05AM +0100, Erik wrote:
> >
> >> I often find myself writing __init__ methods of the form:
> >>
> >> def __init__(self, foo, bar, baz, spam, ham):
> >>   self.foo = foo
> >>   self.bar = bar
> >>   self.baz = baz
> >>   self.spam = spam
> >>   self.ham = ham
> >>
> >> This seems a little wordy and uses a lot of vertical space on the
> >> screen.
> >
> > It does, and while both are annoying, in the grand scheme of things
> > they're a very minor annoyance. After all, this is typically only an
> > issue once per class, and not even every class, and vertical space is
> > quite cheap. In general, the barrier for accepting new syntax is quite
> > high, and "minor annoyance" generally doesn't reach it.
>
> I suspect that with a suitably creative use of inspect.signature() you
> could write a decorator for this:
>
> @auto_attrs
> def __init__(self, a, b, c):
>     # Remaining init code, called with self.a, self.b and self.c set
>
> I don't have time to experiment right now, but will try to find time
> later. If nothing else, such a decorator would be a good prototype for
> the proposed functionality, and may well be sufficient for the likely
> use cases without needing a syntax change.
>
> Paul
>
>
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