Pre-PEP: Dictionary accumulator methods

[bearophileHUGS at lycos.com]

R.H.:
> The setdefault() method would continue to exist but
> would likely not make it into Py3.0.

I agee to remove the setdefault.

I like the new count method, but I don't like the appendlist method,
because I think it's too much specilized.

I too use sets a lot; recently I've suggested to add a couple of set
methods to dicts (working on the keys): intersection() and
difference().

Bearophile