INADA Naoki added the comment:
$ ./install/bin/python3.6-default -m perf timeit -s 'x = range(1000); d={}'
'for i in x: d[i]=i; del d[i];'
....................
Median +- std dev: 363 us +- 11 us
$ ./install/bin/python3.6 -m perf timeit -s 'x = range(1000); d={}' 'for i in
x: d[i]=i; del d[i];' # patched
....................
Median +- std dev: 343 us +- 17 us
$ ./install/bin/python3.6-default -m perf timeit -s 'x = range(1000); d={}'
'for i in x: d[i]=i; del d[i];'
....................
Median +- std dev: 362 us +- 11 us
$ ./install/bin/python3.6 -m perf timeit -s 'x = range(1000); d={}' 'for i in
x: d[i]=i; del d[i];' # patched
....................
Median +- std dev: 342 us +- 14 us
$ ./install/bin/python3.6-default -m perf timeit -s 'x = range(1000); d={}'
'for i in x: d[i]=i; del d[i];'
....................
Median +- std dev: 364 us +- 11 us
----------
assignee: -> inada.naoki
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28199>
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