On Wed, May 29, 2013 at 12:19 PM, Fábio Santos <fabiosantos...@gmail.com> wrote:
> Are you sure you don't want to use a lambda expression? They are pretty
> pythonic.
>
> none_factory = lambda: None
> defaultdict_none_factory = lambda: defaultdict(none_factory)
>
> collections.defaultdict(defaultdict_none_factory)

Gah.  If you're going to go to the trouble of assigning a name to the
lambda, then just use a def statement:

def none_factory: return None
def defaultdict_none_factory: return defaultdict(none_factory)

collections.defaultdict(defaultdict_none_factory)
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