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Groups > comp.lang.python > #64508
| References | <26ff768d-349c-48cd-a46f-25343807e18a@googlegroups.com> |
|---|---|
| Date | 2014-01-23 03:18 +1100 |
| Subject | Re: SIngleton from __defaults__ |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.5843.1390407541.18130.python-list@python.org> (permalink) |
On Thu, Jan 23, 2014 at 3:07 AM, Asaf Las <roegltd@gmail.com> wrote:
> is it possible to create singleton using construct below :
>
> def singleton_provider(x = [None]):
> if singleton_provider.__defaults__[0][0] == None:
> singleton_provider.__defaults__[0][0] = SomeClass()
> return singleton_provider.__defaults__[0][0]
>
Why not simply:
def get_singleton(x = SomeClass()):
return x
Or even:
singleton = SomeClass()
? Neither of the above provides anything above the last one, except
for late creation.
ChrisA
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SIngleton from __defaults__ Asaf Las <roegltd@gmail.com> - 2014-01-22 08:07 -0800
Re: SIngleton from __defaults__ Chris Angelico <rosuav@gmail.com> - 2014-01-23 03:18 +1100
Re: SIngleton from __defaults__ Asaf Las <roegltd@gmail.com> - 2014-01-22 08:37 -0800
Re: SIngleton from __defaults__ 88888 Dihedral <dihedral88888@gmail.com> - 2014-01-22 09:23 -0800
Re: SIngleton from __defaults__ Ned Batchelder <ned@nedbatchelder.com> - 2014-01-22 14:18 -0500
Re: SIngleton from __defaults__ Asaf Las <roegltd@gmail.com> - 2014-01-22 11:52 -0800
Re: SIngleton from __defaults__ Johannes Schneider <johannes.schneider@galileo-press.de> - 2014-01-23 14:36 +0100
Re: SIngleton from __defaults__ Dave Angel <davea@davea.name> - 2014-01-23 11:56 -0500
Re: SIngleton from __defaults__ Terry Reedy <tjreedy@udel.edu> - 2014-01-23 19:10 -0500
Re: SIngleton from __defaults__ Johannes Schneider <johannes.schneider@galileo-press.de> - 2014-01-24 09:20 +0100
Re: SIngleton from __defaults__ Asaf Las <roegltd@gmail.com> - 2014-01-22 13:10 -0800
Re: SIngleton from __defaults__ Asaf Las <roegltd@gmail.com> - 2014-01-22 14:34 -0800
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