On May 28, 11:50 am, Christian Heimes <li...@cheimes.de> wrote: > Am 28.05.2010 11:31, schrieb eb303: > > > > > On May 27, 3:24 pm, Christian Heimes <li...@cheimes.de> wrote: > >>> Do I miss something? > >>> Is this the way to do it, or is there a better one? > > >> A better way was introduced in Python 2.6. > >> Seehttp://docs.python.org/library/functions.html?highlight=property#prop... > >> I have a Python only version around if you are still using Python 2.5. > > >> Christian > > > Mmmm, I might still miss something. OK, I can replace my initial > > property using @property and @p.setter, but it doesn't seem to work in > > subclasses: > > > class A(object): > > @property > > def p(self): > > return self._p > > @p.setter > > def _set_p(self, p): > > self._p = p > > class B(A): > > @p.setter > > def _set_p(self, p): > > … > > > results in: > > > Traceback (most recent call last): > > File "toto.py", line 8, in <module> > > class B(A): > > File "toto.py", line 9, in B > > @p.setter > > NameError: name 'p' is not defined > > It doesn't work because "p" is not in the scope of B's body while B is > created. You have to write > > class B(A): > # access the "p" property from class A > @A.p.setter > def p(self, p): > pass > > # once p is in the class body scope, you must not use A.p again > @p.deleter > def p(self): > pass > > Christian
Well, I still have to explicitely specify the superclass's name then, so IMHO it's not a big improvement over repeating: p = property(A._get_p, _set_p) Thanks anyway… - Eric - -- http://mail.python.org/mailman/listinfo/python-list
