如何在Python中附加json文件? [英] How to append in a json file in Python?

问题描述

我有一个内容为{"67790": {"1": {"kwh": 319.4}}}的json文件.现在，我创建一个字典a_dict，我需要将其附加到json文件中.我尝试了以下操作，但无法正确执行.我要去哪里错了?

I have the a json file whose contents is {"67790": {"1": {"kwh": 319.4}}}. Now I create a dictionary a_dict which I need to append it into the json file. I tried the following but was not able to do it correctly. Where I'm going wrong?

with open(DATA_FILENAME, 'a') as f:
   json_obj = json.dump(a_dict, json.load(f)
   f.write(json_obj)
   f.close()

推荐答案

假定您有一个具有以下内容的test.json文件:

Assuming you have a test.json file with the following content:

{"67790": {"1": {"kwh": 319.4}}}

然后，下面的代码将load json文件，使用dict.update()和dump将内部数据更新为test.json文件:

Then, the code below will load the json file, update the data inside using dict.update() and dump into the test.json file:

import json

a_dict = {'new_key': 'new_value'}

with open('test.json') as f:
    data = json.load(f)

data.update(a_dict)

with open('test.json', 'w') as f:
    json.dump(data, f)

然后，在test.json中，您将拥有:

Then, in test.json, you'll have:

{"new_key": "new_value", "67790": {"1": {"kwh": 319.4}}}

希望这就是您想要的.

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