On 20 Okt, 16:09, Peter Otten <__pete...@web.de> wrote: > Lucasm wrote: > > On 19 Okt, 18:28, Steven D'Aprano <st...@remove-this- > > cybersource.com.au> wrote: > >> On Tue, 19 Oct 2010 06:39:56 -0700, Lucasm wrote: > >> > Hi, > > >> > A question. Is it possible to dynamically override a property? > > >> > class A(object): > >> > @property > >> > def return_five(self): > >> > return 5 > > >> > I would like to override the property for an instance of A to say the > >> > string 'bla'. > >> >>> class A(object): > > >> ... _five = 5 # class attribute shared by all instances > >> ... @property > >> ... def return_five(self): > >> ... return self._five > >> ... > > >> >>> a = A() > >> >>> a._five = 'bla' # set an instance attribute > >> >>> b = A() > >> >>> print a.return_five > >> bla > >> >>> print b.return_five > > >> 5 > > >> -- > >> Steven > > > Thanks for the answers. I would like to override the property though > > without making special modifications in the main class beforehand. Is > > this possible? > > You can dynamically change the instance's class: > > >>> class A(object): > > ... @property > ... def five(self): return 5 > ...>>> a = A() > >>> b = A() > >>> class B(type(b)): > > ... @property > ... def five(self): return "FIVE" > ...>>> b.__class__ = B > >>> a.five > 5 > >>> b.five > > 'FIVE' > > But still -- what you are trying looks like a bad idea. What's your usecase? > > Peter
Thanks for your answer. That's exactly the thing I'm doing right now and it works :) My use case is testing. I want to test a class and reduce the complexity of the output generated by certain properties. It would be nice to know alternatives to this approach. -- http://mail.python.org/mailman/listinfo/python-list
