Re: Proposal: named return values through dict initialization and unpacking

From	Michael Selik <michael.selik@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Proposal: named return values through dict initialization and unpacking
Date	2016-06-26 18:17 +0000
Message-ID	<mailman.10.1466965034.2358.python-list@python.org> (permalink)
References	<CALyUfwV9jO0xjSz_Qhk3ox=rJCcAsBE+iU2WzcmXtCEwZS+xEQ@mail.gmail.com> <mailman.0.1466494641.11516.python-list@python.org> <5769eb4a$0$1610$c3e8da3$5496439d@news.astraweb.com> <CAGgTfkOST9Go5jVmFjKd=GsLW=NLiUo+Udsne5OaMpoNf5PoWA@mail.gmail.com>

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On Tue, Jun 21, 2016 at 9:41 PM Steven D'Aprano <steve@pearwood.info> wrote:

> On Tue, 21 Jun 2016 05:34 pm, Ari Freund wrote:
> >          var3, var1, var2 = **d
>
> But I don't want to use the key names your function uses. I want to
> use names which makes sense for my application
>

Note that my dict unpacking syntax proposal would solve this quite nicely.

    {'var1': width, 'var2': counter, 'var3': aardvark} = d

But the current syntax ain't so bad either. Maybe it's even better, more
readable despite being less concise.

    expected = {'var1', 'var2', 'var3'}
    excess = d.keys() - expected
    if excess:
        raise ValueError('unexpected keys {!r}'.format(excess))
    width = d['var1']
    counter = d['var2']
    aardvark = d['var3']

Thread

Proposal: named return values through dict initialization and unpacking Ari Freund <arief@google.com> - 2016-06-21 10:34 +0300
  Re: Proposal: named return values through dict initialization and unpacking Steven D'Aprano <steve@pearwood.info> - 2016-06-22 11:35 +1000
    Re: Proposal: named return values through dict initialization and unpacking Michael Selik <michael.selik@gmail.com> - 2016-06-26 18:17 +0000
  Re: Proposal: named return values through dict initialization and unpacking arief@google.com - 2016-06-26 08:28 -0700
    Re: Proposal: named return values through dict initialization and unpacking Joonas Liik <liik.joonas@gmail.com> - 2016-06-26 18:50 +0300

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