如何使用Python动态构建JSON对象? [英] How to dynamically build a JSON object with Python?

问题描述

我是Python的新手，并且正在使用JSON数据.我想通过向现有JSON对象添加一些键值来动态构建JSON对象.

I am new to Python and I am playing with JSON data. I would like to dynamically build a JSON object by adding some key-value to an existing JSON object.

我尝试了以下操作，但得到了TypeError: 'str' object does not support item assignment:

I tried the following but I get TypeError: 'str' object does not support item assignment:

import json

json_data = json.dumps({})
json_data["key"] = "value"

print 'JSON: ', json_data

推荐答案

在将对象编码为JSON字符串之前，您需要构建对象:

import json

data = {}
data['key'] = 'value'
json_data = json.dumps(data)

JSON是序列化格式，文本数据表示一个结构.本身不是那个结构.

JSON is a serialization format, textual data representing a structure. It is not, itself, that structure.

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