Serhiy Storchaka added the comment:
The patch makes some operations slightly faster.
$ ./python -m perf timeit -s 'import re; m =
re.match(r"(?P<int>\d+)(?:\.(?P<frac>\d*))?", "12.34")' -- --duplicate 100
'm.lastgroup'
Unpatched: Median +- std dev: 204 ns +- 1 ns
Patched: Median +- std dev: 167 ns +- 2 ns
$ ./python -m perf timeit -s 'import re; m =
re.match(r"(?P<int>\d+)(?:\.(?P<frac>\d*))?", "12.34")' -- --duplicate 100
'm.groupdict()'
Unpatched: Median +- std dev: 2.78 us +- 0.05 us
Patched: Median +- std dev: 1.98 us +- 0.04 us
$ ./python -m perf timeit -s 'import re; m =
re.match(r"(?P<int>\d+)(?:\.(?P<frac>\d*))?", "12.34")' -- --duplicate 100
'm.start("frac")'
Unpatched: Median +- std dev: 638 ns +- 22 ns
Patched: Median +- std dev: 576 ns +- 16 ns
$ ./python -m perf timeit -s 'import re; m =
re.match(r"(?P<int>\d+)(?:\.(?P<frac>\d*))?", "12.34")' -- --duplicate 100
'm.group("frac")'
Unpatched: Median +- std dev: 1.15 us +- 0.03 us
Patched: Median +- std dev: 1.07 us +- 0.03 us
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<http://bugs.python.org/issue28765>
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