On Mon, Dec 1, 2014 at 11:05 AM, Larry Martell <larry.mart...@gmail.com> wrote: > Is there a way to set the default_factory of defaultdict so that > accesses to undefined keys get to set to the key? > > i.e. if d['xxx'] were accessed and there was no key 'xxx' then > d['xxx'] would get set to 'xxx' > > I know I can define a function with lambda for the default_factory, > but I don't see how to access the key. I tried: > > d = defaultdict(lambda: key) > > But that did not work.
Not with defaultdict, but you can subclass dict and provide a __missing__ method directly, which is passed the key. This is basically all that defaultdict does. -- https://mail.python.org/mailman/listinfo/python-list
