Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:
For what it's worth, in my benchmarks on 3.11, methodcaller was already a bit
faster than lambda:
#################### Builtin calls ####################
PS > .\python.bat -m pyperf timeit -s "from operator import methodcaller as mc"
-s "reverse_it = mc('reverse')" -s "arr = []" "reverse_it(arr)"
Running Release|x64 interpreter...
.....................
Mean +- std dev: 84.3 ns +- 1.9 ns
PS >.\python.bat -m pyperf timeit -s "reverse_it = lambda x: x.reverse()" -s
"arr = []" "reverse_it(arr)"
Running Release|x64 interpreter...
.....................
Mean +- std dev: 95.5 ns +- 2.9 ns
#################### Python calls ####################
PS > .\python.bat -m pyperf timeit -s "from operator import methodcaller as mc"
-s "reverse_it = mc('reverse')" -s "class A: reverse = lambda self: None" -s
"arr=A()" "reverse_it(arr)"
Running Release|x64 interpreter...
.....................
Mean +- std dev: 140 ns +- 4 ns
PS > .\python.bat -m pyperf timeit -s "reverse_it = lambda x: x.reverse()" -s
"class A: reverse = lambda self: None" -s "arr=A()" "reverse_it(arr)"
Running Release|x64 interpreter...
.....................
Mean +- std dev: 159 ns +- 4 ns
----------
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<https://bugs.python.org/issue44850>
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