[Python-Dev] Dictionary subclasses and exec

[Guido van Rossum]

> >Alas, this is one of the things that don't work yet.  To set and get
> 
> Oh, well; I need to come up with a different example for subclassing a
> built-in type, then.  Thanks!   <puts on thinking cap>

You can use a similar example but not override __getitem__ /
__setitem__; instead, add some new methods (e.g. merge() -- like
update() but the existing key wins).

--Guido van Rossum (home page: http://www.python.org/~guido/)