Re: [Feature Request] dict.setdefault()

References	<48897e75-c02c-43c7-9f46-39da4bcc406d@p16g2000vbi.googlegroups.com>
Date	2011-04-11 15:53 -0700
Subject	Re: [Feature Request] dict.setdefault()
From	Chris Rebert <clp2@rebertia.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.228.1302562428.9059.python-list@python.org> (permalink)

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On Mon, Apr 11, 2011 at 2:35 PM, rantingrick <rantingrick@gmail.com> wrote:
>
> setdefault should take **kw args in the case of needing to set
> multiple defaults at one time. I would even settle for an *arg list if
> i had to.

What would the return value be? dict.setdefault() doesn't currently
just return None you know.

> Anything is better than...
>
> d.setdefault(blah, blah)
> d.setdefault(blah, blah)
> d.setdefault(blah, blah)
> d.setdefault(blah, blah)
> if blah is not blah:
>    d.setdefault(blah, blah)

The redundancy is easily removed:
defaults = {blah: blah, blah: blah, blah: blah, blah: blah}
defaults.update(d) # clobber defaults with specified vals
d = defaults # swap in, assuming not aliased
# if aliased, then instead:
# d.clear()
# d.update(defaults)
if blah is not blah:
    d.setdefault(blah, blah)

Cheers,
Chris
--
http://blog.rebertia.com

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Thread

[Feature Request] dict.setdefault() rantingrick <rantingrick@gmail.com> - 2011-04-11 14:35 -0700
  Re: [Feature Request] dict.setdefault() Westley Martínez <anikom15@gmail.com> - 2011-04-11 15:16 -0700
  Re: [Feature Request] dict.setdefault() MRAB <python@mrabarnett.plus.com> - 2011-04-11 23:41 +0100
    Re: dict.setdefault() rantingrick <rantingrick@gmail.com> - 2011-04-11 19:58 -0700
      Re: dict.setdefault() Westley Martínez <anikom15@gmail.com> - 2011-04-12 07:02 -0700
  Re: [Feature Request] dict.setdefault() Chris Angelico <rosuav@gmail.com> - 2011-04-12 08:44 +1000
  Re: dict.setdefault() Raymond Hettinger <python@rcn.com> - 2011-04-11 15:49 -0700
  Re: [Feature Request] dict.setdefault() Chris Rebert <clp2@rebertia.com> - 2011-04-11 15:53 -0700
  Re: [Feature Request] dict.setdefault() MRAB <python@mrabarnett.plus.com> - 2011-04-11 23:59 +0100
  Re: [Feature Request] dict.setdefault() Tim Chase <python.list@tim.thechases.com> - 2011-04-11 18:25 -0500
    Re: dict.setdefault() Raymond Hettinger <python@rcn.com> - 2011-04-11 17:17 -0700

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