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Groups > comp.lang.python > #66102
| From | Gregory Ewing <greg.ewing@canterbury.ac.nz> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: singleton ... again |
| Date | 2014-02-13 10:57 +1300 |
| Message-ID | <bm291gF4dvqU1@mid.individual.net> (permalink) |
| References | <fdbb58a7-87c0-4a2f-bedf-f8e3e14fa356@googlegroups.com> <mailman.6728.1392183929.18130.python-list@python.org> <9785668d-6bea-4382-8a0c-c1258f2e2693@googlegroups.com> <9b4cd207-5485-43b2-b67a-520ef4a50075@googlegroups.com> |
Asaf Las wrote:
> There is another one.
> Once object passes through singletonizator
> there wont be any other object than first one.
>
> Then object constructor can freely be used in every place
> of code.
You're still making things far more complicated
than they need to be.
*Why* do you want to be able to use the object
constructor, instead of just using the prebuilt
instance?
If you want to hide the distinction between using
call syntax and just accessing a global, then
export a function that returns the global instance.
That function can even lazily create the instance
the first time it's called. That's a pattern that
*is* useful, and I've often used in Python and
other languages.
E.g.
_the_whatsit = None
def get_whatsit():
if _the_whatsit is None:
_the_whatsit = Whatsit()
return _the_whatsit
--
Greg
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singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-11 20:34 -0800
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-11 21:15 -0800
Re:singleton ... again Dave Angel <davea@davea.name> - 2014-02-12 00:48 -0500
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-12 00:55 -0500
Re: singleton ... again Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-12 23:04 +1300
Re: singleton ... again Ben Finney <ben+python@benfinney.id.au> - 2014-02-12 21:09 +1100
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-12 08:40 -0500
Re: singleton ... again Piet van Oostrum <piet@vanoostrum.org> - 2014-02-13 10:00 +0100
Re: singleton ... again Ned Batchelder <ned@nedbatchelder.com> - 2014-02-13 06:50 -0500
Re: singleton ... again Chris Angelico <rosuav@gmail.com> - 2014-02-13 22:57 +1100
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-13 10:24 -0500
Re: singleton ... again Chris Angelico <rosuav@gmail.com> - 2014-02-14 07:03 +1100
Re: singleton ... again Robert Kern <robert.kern@gmail.com> - 2014-02-13 21:13 +0000
Re: singleton ... again Chris Angelico <rosuav@gmail.com> - 2014-02-14 08:27 +1100
Re: singleton ... again Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 08:57 -0800
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-13 12:57 -0500
Re: singleton ... again Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 10:31 -0800
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-13 14:03 -0500
Re: singleton ... again Chris Angelico <rosuav@gmail.com> - 2014-02-14 06:50 +1100
Re: singleton ... again Grant Edwards <invalid@invalid.invalid> - 2014-02-13 22:28 +0000
Re: singleton ... again Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-14 18:21 +1300
Re: singleton ... again Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-14 06:16 +1100
Re: singleton ... again Steven D'Aprano <steve@pearwood.info> - 2014-02-13 02:58 +0000
Re: singleton ... again Ben Finney <ben+python@benfinney.id.au> - 2014-02-13 14:07 +1100
Re: singleton ... again Steven D'Aprano <steve@pearwood.info> - 2014-02-13 04:24 +0000
Re: singleton ... again Chris Angelico <rosuav@gmail.com> - 2014-02-13 15:33 +1100
Re: singleton ... again Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-14 18:15 +1300
Re: singleton ... again Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-14 18:06 +1300
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 09:50 -0800
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 09:56 -0800
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 09:58 -0800
Re: singleton ... again Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-13 10:57 +1300
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 17:38 -0800
Re: singleton ... again Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 18:57 +0000
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 17:02 -0800
Re: singleton ... again Ned Batchelder <ned@nedbatchelder.com> - 2014-02-12 16:34 -0500
Re: singleton ... again Asaf Las <roegltd@gmail.com> - 2014-02-12 17:34 -0800
Re: singleton ... again Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-13 10:08 +1100
Re: singleton ... again Roy Smith <roy@panix.com> - 2014-02-12 20:57 -0500
Re: singleton ... again Michael Torrie <torriem@gmail.com> - 2014-02-12 15:05 -0700
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