Serhiy Storchaka <[email protected]> added the comment:
This adds an overhead to every indexing.
$ ./python -m perf timeit --compare-to=./python0 -s 'a = [1]' --duplicate=10000
'a[0]'
python0: ..................... 15.3 ns +- 0.5 ns
python: ..................... 16.1 ns +- 0.3 ns
Mean +- std dev: [python0] 15.3 ns +- 0.5 ns -> [python] 16.1 ns +- 0.3 ns:
1.05x slower (+5%)
$ ./python -m perf timeit --compare-to=./python0 -s 'd = {1: 2}'
--duplicate=10000 'd[1]'
python0: ..................... 17.6 ns +- 0.6 ns
python: ..................... 18.4 ns +- 0.5 ns
Mean +- std dev: [python0] 17.6 ns +- 0.6 ns -> [python] 18.4 ns +- 0.5 ns:
1.05x slower (+5%)
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<https://bugs.python.org/issue32226>
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