合并两个字典列表 [英] Combine two lists of dictionaries

问题描述

[{"APPLE": ["RED"]}, {"BANANA": ["YELLOW", "GREEN"]}, {"APPLE": ["GREEN"]}]

使用此词典列表， 我该如何组合相同的键?

Using this list of dictionaries, how can i combine same keys?

[{"APPLE": ["RED","GREEN"]}, {"BANANA": ["YELLOW", "GREEN"]}]

我想得到这个结果.

推荐答案

您可以通过创建用于存储映射的中间字典来以所需的格式实现list(甚至最好使用

You may achieve the list in desired format via creating intermediate dictionary to store the mapping (even better to use collections.defaultdict) as:

from collections import defaultdict

my_list = [{"APPLE": ["RED"]}, {"BANANA": ["YELLOW", "GREEN"]}, {"APPLE": ["GREEN"]}]
temp_dict = defaultdict(list)

for item in my_list:
    for k, v in item.items():
        temp_dict[k] += v

# content of `temp_dict` is:
#     {
#          'APPLE': ['RED', 'GREEN'], 
#          'BANANA': ['YELLOW', 'GREEN']
#     }

要将dict转换为所需格式的列表，可以使用 list comprehension 表达式，如下所示:

For converting the dict to the list of desired format, you may use a list comprehension expression as:

>>> new_list = [{k: v} for k, v in temp_dict.items()]
>>> new_list
[{'APPLE': ['RED', 'GREEN']}, {'BANANA': ['YELLOW', 'GREEN']}]

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