Hi Steven,
I understand your solution. It is correct and works.
But the missing five characters "self." in the upstream code
produces a lot of more lines in the final result.
Regards,
Thomas Güttler
Am Freitag, 12. Juni 2015 14:24:06 UTC+2 schrieb Steven D'Aprano:
> On Fri, 12 Jun 2015 04:12:52 -0700, Thomas Güttler wrote:
>
> > Here is a snippet from the argparse module:
> >
> > {{{
> > def parse_known_args(self, args=None, namespace=None):
> > ...
> > # default Namespace built from parser defaults if namespace is
> > None:
> > namespace = Namespace() # < ======= my issue
> > }}}
> >
> > I subclass from the class of the above snippet.
> >
> > I would like to use a different Namespace class.
> >
> > if the above could would use
> >
> > namespace = self.Namespace()
> >
> > it would be very easy for me to inject a different Namespace class.
>
> Yes it would.
>
> And here is how you do it, even when the parent class doesn't:
>
> class MySubclass(ParentClass):
> Namespace = Namespace
> def parse_known_args(self, args=None, namespace=None):
> if namespace is None:
> namespace = self.Namespace()
> # any other method overriding needed
> return super().parse_known_args(args, namespace)
>
> In Python 2, you cannot use super(), you have to explicitly provide the
> arguments:
>
> return super(MySubclass,self).parse_known_args(args,namespace)
>
>
> --
> Steve
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