deepdict: quickly create highly nested dictionary structures without lots of initialization steps.

deepdict.py

'''deepdict: quickly create highly nested dictionary structures without lots
of initialization steps.'''
from collections import defaultdict

class deepdict(defaultdict):
    def __init__(self, *a, **kw):
        defaultdict.__init__(self, deepdict, *a, **kw)

    def __add__(self, num):
        return num

    def __str__(self):
        return str(self.shallow)

    @property
    def shallow(self):
        out = {}
        for k, v in self.items():
            if isinstance(v, deepdict):
                v = v.shallow
            out[k] = v
        return out

def main():
    foo = deepdict()
    foo['bar']['baz']['qux'] += 5
    print foo