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singleton ... again


Ben Finney <ben+python at benfinney.id.au> writes:

> Gregory Ewing <greg.ewing at canterbury.ac.nz> writes:
>
>> Roy Smith wrote:
>> > It looks to me like he's trying to implement a classic Gang of Four
>> > singleton pattern.
>>
>> Which I've never really seen the point of in Python, or any other
>> language for that matter. Just create one instance of the class during
>> initialisation, put it in a global somewhere, and use it thereafter.
>
> Make that ?somewhere? a module namespace, and you effectively have a
> Singleton for all practical purposes. So yes, I see the point of it; but
> we already have it built in :-)

There is a use case for a singleton class: when creating the singleton
object takes considerable resources and you don't need it always in your
program.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]