Serhiy Storchaka added the comment:
The regression was added by the fix for issue26811. PR 1272 applies the
alternate patch from issue26811. This doesn't harm the performance.
$ ./python.patched -m perf timeit -q --compare-to ./python.default -s "from
collections import namedtuple; P = namedtuple('P', 'x y'); p = P(1, 2)"
--duplicate 1000 "p.x"
Mean +- std dev: [python.default] 128 ns +- 7 ns -> [python.patched] 121 ns +-
7 ns: 1.05x faster (-5%)
I thought about tests, but I don't know what is the best place for them. Seems
other environment variables that controls debug output are not tested too.
----------
nosy: +haypo
stage: -> patch review
versions: +Python 3.5, Python 3.7
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