On Thursday, February 1, 2018 at 10:37:32 AM UTC-8, Chris Angelico wrote: > On Fri, Feb 2, 2018 at 5:22 AM, Sean DiZazzo <sean.diza...@gmail.com> wrote: > > Hi! > > > > I basically just want to create an alias to an attribute on an item's > > superclass. So that after I create the subclass object, I can access the > > alias attribute to get the value back. > > > > <pre> > > class Superclass(object): > > def __init__(self, value): > > """ > > I want to pass x by reference, so that any time > > x on the subclass is updated, so is the alias here > > """ > > self.alias = value > > > > class Subclass(Superclass): > > def __init__(self, x): > > self.x = x > > Superclass.__init__(self, self.x) > > > > def __repr__(self): > > return "x: %s\nalias: %s" % (self.x, self.alias) > > > > > > if __name__ == "__main__": > > foo = Subclass(1) > > print foo.alias > > > > foo.x = 6 > > # Should return 6 !!! > > print foo.alias > > > > </pre> > > ISTM the easiest way would be to define a property on the superclass: > > class Superclass(object): > @property > def alias(self): > return self.x > > Whatever happens, self.alias will be identical to self.x. Is that what > you're after? > > ChrisA
Yes, but that doesn't seem to work. It looks like there is a way to do it if you make the original value a list (mutable) instead of an integer. I really need to do it with an arbitrary object. Not sure if I can hack the list trick to work in my case though. -- https://mail.python.org/mailman/listinfo/python-list
