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Tue Dec 14 01:31:01 CET 2010 · http://mail.python.org/pipermail/python-dev/2010-December/106799.html

On Tue, Dec 14, 2010 at 5:39 AM, Mark Dickinson <dickinsm at gmail.com> wrote:

> On Mon, Dec 13, 2010 at 3:51 PM, R. David Murray <rdmurray at bitdance.com>
> wrote:
> > It seems like the status quo is fine.  I wouldn't object to it being
> > made more consistent.  I would object to removing the existing cases.
>
> Same here, on all three counts.  In one of the projects I'm currently
> working on, we've settled on a style that does quite a lot of:
>
> my_thing = Thing(
>    foo = Foo(arg1, arg2, ...),
>    bar = Bar(arg3, arg4, ...),
>    ...
> )
>
> and I've found the trailing comma very convenient during refactoring
> and API experimentation.  (There's still good fun to be had arguing
> about the indentation of that closing parenthesis, though.)
>

Another valid use case that occurred to me is building up a string-keyed
dictionary:

mapping = dict(
  x=1,
  y=2,
  z=3,
)

So, on reflection, removing the existing cases where it is supported is
certainly unreasonable, which makes the consistency argument that much
stronger.

For the record, I reopened issue #9232 (noting the lack of consensus), and
(as someone suggested on the tracker) changed the resolution on the other
one to be as a duplicate of #9232.

Cheers,
Nick.

P.S. As I noted in the logging discussion, my email access is going to be a
bit sketchy for the next couple of weeks.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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[Python-Dev] A grammatical oddity: trailing commas in argument lists -- continuation