python字典中的多个键可以吗？ [英] multiple keys in python dictionary, is possible?

问题描述

我想在python中构建一个字典，其中不同的键指向相同的元素。我有这个字典：

I'd like to build a dictionary in python in which different keys refer to the same element. I have this dictionary:

persons = {"George":'G.MacDonald', "Luke":'G.MacDonald', "Larry":'G.MacDonald'} 

键全部指向一个相同的字符串，字符串在程序中有不同的内存位置，我想制作一个字典，其中所有这些键指向相同的元素，是可能吗？

the key refer all to an identical string but the strings have different memory location inside the program, I'd like to make a dictionary in which all these keys refer to the same element, is that possible?

推荐答案

您可以执行以下操作：

import itertools as it

unique_dict = {}
value_key=lambda x: x[1]
sorted_items = sorted(your_current_dict.items(), key=value_key)
for value, group in it.groupby(sorted_items, key=value_key):
    for key in group:
        unique_dict[key] = value

将您的字典转换为字典，其中任何类型（但可比较）的相等值是唯一的。如果你的值不可比较（但是可以是hash），你可以使用一个临时的 dict ：

This transforms your dictionary into a dictionary where equal values of any kind(but comparable) are unique. If your values are not comparable(but are hashable) you could use a temporary dict:

from collections import defaultdict
unique_dict = {}
tmp_dict = defaultdict(list)

for key, value in your_current_dict.items():
    tmp_dict[value].append(key)

for value, keys in tmp_dict.items():
    unique_dict.update(zip(keys, [value] * len(keys)))

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