On Thu, Nov 22, 2012 at 10:52:56AM -0500, Dave Angel wrote:
> On 11/22/2012 10:14 AM, Marc Aymerich wrote:
> > I want to create a method within a class that is able to accept either a
> > class or an instance.
> >
>
> I haven't tried it, but how about if you do a @classmethod decorator,
> and then just use isinstance(param, MyClass) ?
>
This won't work:
In [22]: class Foo(object):
....: @classmethod
....: def bar(cls):
....: print repr(cls)
....:
In [23]: Foo.bar()
<class '__main__.Foo'>
In [24]: Foo().bar()
<class '__main__.Foo'>
Actually help(classmethod) explicitly says so:
<quote>
It can be called either on the class (e.g. C.f()) or on an instance
(e.g. C().f()). The instance is ignored except for its class.
</quote>
I think the way to go is via the descriptor protocol[1] as suggested
by Peter.
Regards,
Thomas.
Footnotes:
[1] http://docs.python.org/3/howto/descriptor.html
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