On Thu, Jan 27, 2011 at 11:41 PM, Daniel Urban <urban.d...@gmail.com> wrote:
> Actually it can. You don't have to modify the object, just check for > the desired methods/signature/whatever. See for example the > implementation of collections.Hashable.__subclasshook__ in _abcoll.py > and the abc.ABCMeta.__instancecheck__ method. Mmh, I don't get your examples (subclasshook checks for *classes*, not instances, and ABCMeta is a metaclass whose instance is an ABC), but after properly looking at the PEP (__instancecheck__ seems to be poorly documented in python standard docs) I've seen that yes, __instancecheck__ on an ABC can actually be used in place of maybe_implemented_by and hooking into isinstance(). Thanks! -- Alan Franzoni -- contact me at public@[mysurname].eu -- http://mail.python.org/mailman/listinfo/python-list
