Serhiy Storchaka added the comment:
Following patch replaces abstract types API with concrete types API and makes
the memory consumption of the pattern object smaller if there are no named
groups.
$ ./python -m perf timeit -s "import re; m = re.match('(?P<first>first)
(?P<second>second)', 'first second')" -- "m.lastgroup"
Unpatched: Median +- std dev: 89.8 ns +- 1.8 ns
Patched: Median +- std dev: 80.5 ns +- 3.3 ns
$ ./python -m perf timeit -s "import re; m = re.match('(?P<first>first)
(?P<second>second)', 'first second')" -- "m.groupdict()"
Unpatched: Median +- std dev: 803 ns +- 16 ns
Patched: Median +- std dev: 711 ns +- 16 ns
$ ./python -m perf timeit -s "import re; m = re.match('(?P<first>first)
(?P<second>second)', 'first second')" -- "m['first']"
Unpatched: Median +- std dev: 228 ns +- 14 ns
Patched: Median +- std dev: 217 ns +- 11 ns
----------
components: +Regular Expressions
nosy: +ezio.melotti, mrabarnett
stage: -> patch review
Added file: http://bugs.python.org/file45607/sre-concrete.patch
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<http://bugs.python.org/issue28765>
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