GH-100425: Note improved commutativity in sum(). - #107785
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rhettinger merged 1 commit intoAug 8, 2023
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Script to demonstrate the improvement: from random import random
from itertools import permutations
n = 4
trials = 100
errors = 0
for i in range(trials):
example = [random() for i in range(n)]
if len(set(map(sum, permutations(example)))) != 1:
errors += 1
print(i, sorted(example))
print(f'{errors / trials * 100.0=}%')
Formerly there was a 63% error rate. Now it is zero. |
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Thanks @rhettinger for the PR 🌮🎉.. I'm working now to backport this PR to: 3.12. |
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GH-107787 is a backport of this pull request to the 3.12 branch. |
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miss-islington
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(cherry picked from commit aab6f71) Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
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📚 Documentation preview 📚: https://cpython-previews--107785.org.readthedocs.build/