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- >>> import collections
- >>> HierDictFactory = lambda: collections.defaultdict(lambda: HierDictFactory())
- >>> HierDict = HierDictFactory()
- >>> HierDict["a"]["b"] = 1
- >>> HierDict["a"]["c"] = 2
- >>> HierDict["a"]
- defaultdict(<function <lambda> at 0x225c938>, {u'c': 2, u'b': 1})
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