当值不唯一时，转置值并在python字典中键入键 [英] Transpose values and key in python dictionary when values are not unique

问题描述

我想将键更改为python字典中的值，但是原始字典中的值不是唯一的.

I want to change keys to values in a python dictionary, but the values in the original dictionary are not unique.

这就是我所拥有的:

year_person = {2000: ‘Linda’, 2001: ‘Ron’, 2002: ‘Bruce’, 2003: ‘Linda’, 2004: ‘Bruce’, 2005 ‘Gary’, 2006: ‘Linda’}

这就是我想要将其更改为:

This is what I want to change it to:

person_year = {‘Linda’: 2000, ‘Ron’: 2001, ‘Bruce’: 2002, ‘Linda’, 2003: ‘Bruce’, 2004 ‘Gary’, 2005: ‘Linda’: 2006}

当我尝试使用for循环将其转换时，每个人只有一对匹配对.

When I tried to convert it using a for loop, I only got one matching pair for each person.

推荐答案

您也可以使用defaultdict来做到这一点:

You can also do it with a defaultdict:

year_person = {2000: 'Linda', 2001: 'Ron', 2002: 'Bruce', 2003: 'Linda', 2004: 'Bruce', 2005: 'Gary', 2006: 'Linda'}

from collections import defaultdict
d = defaultdict(list)
for k, v in year_person.items():
    d[v].append(k)

print dict(d)
>>> {'Bruce': [2002, 2004], 'Linda': [2000, 2003, 2006], 'Ron': [2001], 'Gary': [2005]}

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