[Python-Dev] PEP 318 - posting draft (original) (raw)

Guido van Rossum guido at python.org
Wed Mar 24 13:32:04 EST 2004

>> I think this use case is rather elegant: >> >> def singleton(cls): >> return cls() >> >> class Foo [singleton]: >> ...

Guido> And how would this be better than Guido> class Foo(singleton): Guido> ... Guido> (with a suitable definition of singleton, which could just be Guido> 'object' AFAICT from your example)? "Better"? I don't know. Certainly different. In the former, Foo gets bound to a class instance. In the latter, it would be a separate step which you omitted: class Foo(singleton): ... Foo = Foo()

Ok, so the metaclass would have to be a little different, but this can be done with metaclasses. (But I think that this in particular example, declaring the instance through the class is merely confusing. :-)

--Guido van Rossum (home page: http://www.python.org/~guido/)

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