On Thursday, November 22, 2012 5:26:59 PM UTC+1, Dave Angel wrote: > On 11/22/2012 11:12 AM, Thomas Bach wrote: > > > 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> > > > > OK, thanks. I hadn't tried it, and hadn't noticed that that decorator > > converts to the class. > > > > > > > > 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 > > > > > The OP should probably use this link instead, since he's not using Python 3. > > > > http://docs.python.org/2.7/howto/descriptor.html > > > > Marc: I believe the descriptor stuff has changed in Python 3; I don't > > use it. But if you've got to do this, and you have to do it in Python > > 2.x, you'd better use the 2.x documentation. >
thanks for the links Thomas and Dave, I'm going to read this documentation right now, I love to learn this kind of python 'internals' :) -- http://mail.python.org/mailman/listinfo/python-list
