At Friday 27/10/2006 21:09, Ben Finney wrote:
> > > GLOBAL = object()
> > >
> > > def insert_ids(ids=GLOBAL):
> > > if ids is GLOBAL:
> > > ids = get_global_ids()
> >
> >The one disadvantage of this approach is that it complicates
> >pickling if/when you store the stentinel in an instance. There are
> >ways of working around that, but none are pleasant.
>
> But why should you store the sentinel in an instance? It's only
> purpose is to detect a special case in the parameter, when None is
> not appropiate.
You might be storing values that will later become parameters to the
function.
ids_to_be_processed_later = {
'chin': [14, 7, 9],
'bin': foo.GLOBAL,
'fin': [74, 98, 12],
}
serialise_stuff()
Well... just don't do that! :)
Instead of a dict, use another class instance with a class attribute
(like on my earlier post).
--
Gabriel Genellina
Softlab SRL
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