an example of a singleton design pattern in python?

[Peter Hansen]

Ville Vainio wrote:
> 
> >>>>> "Daniel" == Daniel Ortmann <dortmann at lsil.com> writes:
> 
>     Daniel> Hello, Does anyone have an example of a singleton design
>     Daniel> pattern in python?
> 
> This trivial snippet might be enough for your needs:
> 
> class Foo():
>     pass
> 
> _inst = None
> 
> def fooinstance():
>     if not _inst:
>         _inst = Foo()
>     return _inst

Looks like at least two errors, one being the parentheses on the
class name, and the other being a failure to flag _inst as being
global...

-Peter