Josh Rosenberg added the comment:
For the record, legitimate case when many empty dicts are created, and few are
populated, is the collections-free approach to defaultdict(dict):
mydict.setdefault(key1, {})[key2] = val
For, say, 100 unique key1s, and 10,000 total key1/key2 pairs, you'd create
10,000 empty dicts, discarding 9,900 of them. Granted,
collections.defaultdict(dict) is even better (avoids the 9,900 unused dicts
entirely), but I see the setdefault pattern enough, usually with list or dict,
that it's not totally unreasonable to account for it.
----------
nosy: +josh.r
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<http://bugs.python.org/issue30040>
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