bpo-44953: Add vectorcall for itemgetter and attrgetter by sweeneyde · Pull Request #27828 · python/cpython

from operator import itemgetter, attrgetter
from itertools import repeat
from collections import namedtuple, deque
from pyperf import Runner

class DefaultClass:
    def __init__(self, a, b):
        self.a = a
        self.b = b

class SlotsClass:
    __slots__ = "a", "b"
    def __init__(self, a, b):
        self.a = a
        self.b = b

NamedTuple = namedtuple("NT", ["a", "b"])
MAP_LOOPS = 10_000

attr_classes = {
    'DefaultClass': DefaultClass,
    'SlotsClass': SlotsClass,
    'NamedTuple': NamedTuple,
}

item_classes = {
    'tuple': tuple,
    'list': list,
    'dict': dict.fromkeys,
}

namespace = {
    'IG': itemgetter(1),
    'AG': attrgetter('a'),
    'repeat': repeat,
    'deque': deque,
} | attr_classes | item_classes

runner = Runner()

for classname in attr_classes:
    runner.timeit(
        name=f"{classname}-1",
        setup=f"obj = {classname}(11, 22)",
        stmt="AG(obj)",
        globals=namespace
    )
    runner.timeit(
        name=f"{classname}-map",
        setup=f"obj = {classname}(11, 22)",
        stmt=f"deque(map(AG, repeat(obj, {MAP_LOOPS})), maxlen=0)",
        globals=namespace,
        inner_loops=MAP_LOOPS,
    )

for classname in item_classes:
    runner.timeit(
        name=f"{classname}-1",
        setup=f"obj = {classname}((1, 2, 3, 4, 5))",
        stmt="IG(obj)",
        globals=namespace,
    )
    runner.timeit(
        name=f"{classname}-map",
        setup=f"obj = {classname}((1, 2, 3, 4, 5))",
        stmt=f"deque(map(IG, repeat(obj, {MAP_LOOPS})), maxlen=0)",
        globals=namespace,
        inner_loops=MAP_LOOPS,
    )