如何在使用Python从文件中检索的JSON数据中添加键值?
我是Python的新手,并且正在使用JSON数据.我想从文件中检索JSON数据,然后即时"将JSON键值添加到该数据中.
I am new to Python and I am playing with JSON data. I would like to retrieve the JSON data from a file and add to that data a JSON key-value "on the fly".
也就是说,我的json_file
包含JSON数据,如下所示:
That is, my json_file
contains JSON data as-like the following:
{"key1": {"key1A": ["value1", "value2"], "key1B": {"key1B1": "value3"}}}
我想将"ADDED_KEY": "ADDED_VALUE"
键值部分添加到上述数据中,以便在脚本中使用以下JSON:
I would like to add the "ADDED_KEY": "ADDED_VALUE"
key-value part to the above data so to use the following JSON in my script:
{"ADDED_KEY": "ADDED_VALUE", "key1": {"key1A": ["value1", "value2"], "key1B": {"key1B1": "value3"}}}
为了达到上述目的,我正在尝试编写如下内容:
I am trying to write something as-like the following in order to accomplish the above:
import json
json_data = open(json_file)
json_decoded = json.load(json_data)
# What I have to make here?!
json_data.close()
您的json_decoded
对象是Python字典;您只需在其中添加密钥,然后重新编码并重写文件即可:
Your json_decoded
object is a Python dictionary; you can simply add your key to that, then re-encode and rewrite the file:
import json
with open(json_file) as json_file:
json_decoded = json.load(json_file)
json_decoded['ADDED_KEY'] = 'ADDED_VALUE'
with open(json_file, 'w') as json_file:
json.dump(json_decoded, json_file)
我在这里使用打开的文件对象作为上下文管理器(使用with
语句),因此Python完成后会自动关闭文件.
I used the open file objects as context managers here (with the with
statement) so Python automatically closes the file when done.