On Tue, 11 Apr 2006 19:11:46 -0700, mrdylan wrote: > Given a class like so: > > ------------------------------- > class TestMe(object): > def get(self): > pass > def set(self, v): > pass > > p = property( get, set ) > > t = TestMe() > type(t.p) #returns NoneType, what???
t.p calls t.get() which returns None. So t.p is None, and type(t.p) is NoneType. > t.p.__str__ #returns <method-wrapper object at XXXXXXX> > ----------------------------------- > > What is the best way to determine that the attribute t.p is actually a > property object? Obviously I can test the __str__ or __repr__ > attributes using substring comparison but there must be a more elegant > idiom. If you want a general purpose solution for an object introspection tool, I must admit I'm as lost as you are. The only thing I have come up with is this nasty hack: >>> t.p is None True >>> dir(t.p) is dir(None) False >>> for attr in dir(None): ... print attr, getattr(None, attr) is getattr(t.p, attr) ... __class__ True __delattr__ False __doc__ True __getattribute__ False __hash__ False __init__ False __new__ True __reduce__ False __reduce_ex__ False __repr__ False __setattr__ False __str__ False I don't even know if this hack generalises to any values of p, and I suspect it isn't of practical use. Why do you want to know if p is a property? -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
