如何在Python字典中的键中添加多个值 [英] How to add multiple values to a key in a Python dictionary

问题描述

我正在尝试根据name_num字典中的值创建一个字典，其中列表的长度是新键，而name_num字典中的键和值是值.所以:

I am trying to create a dictionary from the values in the name_num dictionary where the length of the list is the new key and the name_num dictionary key and value are the value. So:

name_num = {"Bill": [1,2,3,4], "Bob":[3,4,2], "Mary": [5, 1], "Jim":[6,17,4], "Kim": [21,54,35]}

我要创建以下字典:

new_dict = {4:{"Bill": [1,2,3,4]}, 3:{"Bob":[3,4,2], "Jim":[6,17,4], "Kim": [21,54,35]}, 2:{"Mary": [5, 1]}}

我尝试了许多变体，但是这段代码使我最接近:

I've tried many variations, but this code gets me the closest:

for mykey in name_num:
    new_dict[len(name_num[mykey])] = {mykey: name_num[mykey]}

输出:

new_dict = {4:{"Bill": [1,2,3,4]}, 3:{"Jim":[6,17,4]}, 2:{"Mary": [5, 1]}}

我知道我需要以某种方式遍历代码，以便可以将其他值添加到键3中.

I know I need to loop through the code somehow so I can add the other values to key 3.

推荐答案

词典，关联数组或地图(许多名称，基本上具有相同的功能)属性是键是唯一的.

Dictionary, associative array or map (many names, basically the same functionality) property is that keys are unique.

如果长度相同，则希望拥有的键(整数)不是唯一的，这就是为什么代码无法正常工作的原因.为现有键输入新值意味着替换旧值.

The keys you wish to have, which are integers, are not unique if lengths are the same, that's why your code doesn't work. Putting a new value for existing key means replacing the old value.

您必须将键值对添加到现有的值字典中.

You have to add key-value pairs to the existing value dictionaries.

for mykey in name_num:
    length = len(name_num[mykey])
    if length in new_dict: # key already present in new dictionary
        new_dict[length][mykey] = name_num[mykey]
    else:
        new_dict[length] = {mykey: name_num[mykey]}

应该可以解决问题

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