Message291817
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. |
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Date |
User |
Action |
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2017-04-18 01:44:38 | josh.r | set | recipients:
+ josh.r, r.david.murray, methane, serhiy.storchaka, xiang.zhang, louielu |
2017-04-18 01:44:38 | josh.r | set | messageid: <1492479878.06.0.231847604447.issue30040@psf.upfronthosting.co.za> |
2017-04-18 01:44:38 | josh.r | link | issue30040 messages |
2017-04-18 01:44:37 | josh.r | create | |
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