Xiang Zhang added the comment:
> I understand that count() is only used when the old and new patterns of
> str.replace() have a different length.
Yes. I thought it won't help much since str.replace get many operations. But
for long string, looks good:
./python3 -m perf timeit --compare-to ~/cpython/python -s
's="abcdefghihijklmnopqrstuvwxyz~!@##$%^&*()-=_+{}|"*100' 's.replace("a", "bc")'
python: ..................... 7.36 us +- 0.04 us
python3: ..................... 4.91 us +- 0.04 us
Median +- std dev: [python] 7.36 us +- 0.04 us -> [python3] 4.91 us +- 0.04 us:
1.50x faster # 50% ??!! how?
And this patch also applies to bytes since they share codes.
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<http://bugs.python.org/issue28921>
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