>>> def a(): b = lambda: defaultdict(b); return b()
>>> x = a(); x[1][2][3] = 'Infinity!'; print dumps(x)
{"1": {"2": {"3": "infinity!"}}}
Defining B in A prevents renames of A from breaking dictionaries made with B.prior art
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Brett Slatkin ()'s status on Saturday, 26-Jan-2013 04:09:00 EST 
Brett Slatkin
Behold! The infinite dict.
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