STINNER Victor <vstin...@python.org> added the comment:
>python -m timeit -s "import collections; d=collections.defaultdict(lambda:
>None); d['abc']=123; " "x=d['XXX']"
5000000 loops, best of 5: 34.3 nsec per loop
This benchmark is not a fair comparison: the 'XXX' key is created at the first
access. In short, this benchmark measure the performance of a dict lookup:
>python -m timeit -s "d={'abc':123}" "x=d['abc']"
5000000 loops, best of 5: 33 nsec per loop
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38278>
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