Hi. Today, I ran across this, in Python 2.7.6: >>> class C: ... pass ... >>> issubclass(C,object) False >>> isinstance(C(),object) True <-- ???
The description of isinstance() in Python 2.7 does not reveal this result (to my reading). >From a duck-typing perspective, one would also not guess that an instance of C would be considered an instance of object: >>> dir(C()) ['__doc__', '__module__'] >>> dir(object()) ['__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__ ', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__'] -> What is the motivation for isinstance(C,object) to return True in Python 2.7? Andy Andreas Maier IBM Senior Technical Staff Member, Systems Management Architecture & Design IBM Research & Development Laboratory Boeblingen, Germany mai...@de.ibm.com, +49-7031-16-3654 ________________________________________________________________________ IBM Deutschland Research & Development GmbH Vorsitzende des Aufsichtsrats: Martina Koederitz Geschaeftsfuehrung: Dirk Wittkopp Sitz der Gesellschaft: Boeblingen Registergericht: Amtsgericht Stuttgart, HRB 243294 _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
