Serhiy Storchaka added the comment:
Microbenchmarks:
$ ./python -m perf timeit --duplicate 100 "enumerate('abc')"
Unpatched: Median +- std dev: 1.76 us +- 0.10 us
Patched: Median +- std dev: 1.61 us +- 0.07 us
$ ./python -m perf timeit --duplicate 100 "enumerate('abc', 1)"
Unpatched: Median +- std dev: 2.14 us +- 0.09 us
Patched: Median +- std dev: 1.76 us +- 0.07 us
$ ./python -m perf timeit --duplicate 100 "reversed('abc')"
Unpatched: Median +- std dev: 1.20 us +- 0.06 us
Patched: Median +- std dev: 1.20 us +- 0.07 us
enumerate() is 9-21% faster (due to avoiding of tuple creating), reversed() is
not changed (Argument Clinic generates the same parsing code for it).
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<http://bugs.python.org/issue20186>
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