在Python中，如何按每个对象中的值对JSON对象数组进行排序? [英] In Python, how do I sort an array of JSON objects by a value in each object?

问题描述

我正在使用Python 3.7.我有一个JSON对象数组.我想根据每个JOSN对象中的值之一(分数")对对象数组进行排序.我在弄清楚如何编写sort函数时遇到了麻烦.我尝试过了

I'm using Python 3.7. I have an array of JSON objects. I would like to sort the array of objects based on one of the values ("score") in each JOSN object. I'm having trouble figuring out how to write the sort function. I tried this

>>> arr = [{'score': 10, 'name': 'Bob'}, {'score': 15, 'name':'Susan'}, {'score': 1, 'name': 'Skippy'}]
>>> arr
[{'score': 10, 'name': 'Bob'}, {'score': 15, 'name': 'Susan'}, {'score': 1, 'name': 'Skippy'}]
>>> arr.sort(key=json['score'], reverse=True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'json' is not defined
>>> arr.sort(key=json['score'], reverse=True)

但是我不知道如何从sort函数的键"部分引用JSON对象.

but I can't figure out how to reference the JSON object from the "key" part of the sort function.

推荐答案

使用 lambda 函数(带有名为 json 的参数或其他参数):

Use either a lambda function (with a parameter named json or whatever):

arr.sort(key = lambda json: json['score'], reverse=True)

或者， operator.itemgetter :

from operator import itemgetter

arr.sort(key = itemgetter('score'), reverse=True)

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