suggestion: recursive collections.defaultdict

[Marc 'BlackJack' Rintsch]

In <1182184918.766497.315040 at k79g2000hse.googlegroups.com>,
tutufan at gmail.com wrote:

> It seems like
> 
>     x = defaultdict(defaultdict(list))
> 
> should do the obvious, but it doesn't.

It *does* the obvious.  Parenthesis after a name means: call this object
*now*.  Any other behavior wouldn't be obvious.

Ciao,
	Marc 'BlackJack' Rintsch