On Friday, January 24, 2014 10:45:30 PM UTC+2, Chris Angelico wrote: > On Sat, Jan 25, 2014 at 7:32 AM, Asaf Las <r....@gmail.com> wrote: > > On Friday, January 24, 2014 6:37:29 PM UTC+2, Chris Angelico wrote: > >> On Sat, Jan 25, 2014 at 3:31 AM, Asaf Las <r...@gmail.com> wrote: > >> > Hi > >> > Is there way to get list of instances of particular > >> > class through class itself? via metaclass or any other method? > >> Not automatically, but you can make a class that keeps track of its > >> instances with a weak reference system.
> > By "not automatically" do you mean there is no way to get references > > to instances of class via python's provided methods or attributes for class > > object at time the class object is created? > > Correct. > > > And usage of weak reference was suggested only to allow class instances > > garbage collected if for example class static container attribute will be > > used as class instance reference storage? > Weak references mean that the objects will be disposed of as normal, > but that you'll know that they've gone. > > >> > Another question - if class is object is it possible > >> > to delete it? If it is possible then how instances > >> > of that class will behave? > > >> It's possible to unbind the name, but every instance retains a > >> reference to its class, so the class itself won't disappear until > >> there are no instances left of it. > >> ChrisA > > > That is interesting. Is it also reference count mechanism or something else? > > Yes. [1] > > ChrisA > > [1] Within the bounds of the question asked, I think a simple "Yes" is > more useful here than a long and detailed explanation of the many > Pythons and how not all of them refcount at all. Consider this > footnote my apology to the experts who would otherwise feel that I'm > majorly misleading the OP. Sorry. Chris, i like answers which open doors to my curiosity :-) yet i should spend my credits very carefully :-) Thanks Asaf -- https://mail.python.org/mailman/listinfo/python-list
