On Wed, 2 Aug 2017 at 23:26 Ian Pilcher <arequip...@gmail.com> wrote:
> YANQ (Yet Another Newbie Question) ... > > I would like to create a subclass of dict that modifies values as they > are inserted. (Effectively I want to do the equivalent of "interning" > the values, although they aren't strings.) > > Do I need to implement any methods other than __setitem__? (I.e. will > any other methods/operators that add values to the dictionary call my > __setitem__ method?) > Yes. At least update and setdefault will also need to be overridden. You will probably be better off creating a class which inherits from collections.MutableMapping . A MutableMapping subclass behaves like a dict (i.e. is a mapping type) as long as the minimum required methods are defined. See the table for the required methods at https://docs.python.org/3/library/collections.abc.html#collections-abstract-base-classes All of the mixin methods (the ones defined for you) will call the abstract methods you override. -- -- Matt Wheeler http://funkyh.at -- https://mail.python.org/mailman/listinfo/python-list
