On Aug 7, 8:56 pm, Terry Reedy <[EMAIL PROTECTED]> wrote: > Wojtek Walczak wrote: > > Dnia Thu, 7 Aug 2008 14:36:37 -0700 (PDT), szczepiq napisa (a): > >> Pardon me for most likely a dummy question but how do I find out if an > >> object is a class? > > > Use types.ClassType: > > >>>> class Q: > > ... pass > > ... > >>>> import types > >>>> isinstance(Q, types.ClassType) > >>>> True > > That is only true and only works for 2.x old-style classes and not for > 2.x new-style classes and all 3.0 classes, for which isinstance(Q,type) > is True.
isinstance(Q,type) is also true for built in types and C extension types, which may or may not be what the OP wants. The most accurate way I can think of to check for a class defined in Python is to test the type's tp_flags field for Py_TPFLAGS_HEAPTYPE bit, but I don't know of any simple way to check for it from Python. It's still possible for it to fail since someone could create heap types in C though I'd expect that's very rare. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
