有更好的python等价物吗?

以下是两种可能的替代方案:

import math
from functools import reduce
from collections import defaultdict


def map_keys_with(combine_f, op, mp):
    ret = {}
    for it in mp:

        if op(it) in ret:
            ret[op(it)] = combine_f(ret[op(it)], mp[it])
        else:
            ret[op(it)] = mp[it]
    return ret


def map_keys_with_setdefault(combine_f, op, mp):
    ret = {}
    for key, value in mp.items():
        ret.setdefault(op(key), []).append(value)

    return {key: reduce(combine_f, values) for key, values in ret.items()}


def map_keys_with_defaultdict(combine_f, op, mp):
    ret = defaultdict(list)
    for key, value in mp.items():
        ret[op(key)].append(value)
    return {key: reduce(combine_f, values) for key, values in ret.items()}


z = {1: 2, 3: 4, 10: 11}
print(map_keys_with(lambda x, y: x + y, lambda x: math.floor(x / 10), z))
print(map_keys_with_setdefault(lambda x, y: x + y, lambda x: math.floor(x / 10), z))
print(map_keys_with_defaultdict(lambda x, y: x + y, lambda x: math.floor(x / 10), z))

输出

{0: 6, 1: 11}
{0: 6, 1: 11}
{0: 6, 1: 11}