将新的JSON数据存储到python中的现有文件

Question

I've been looking around the web and I cannot find a way on adding new JSON data to array.

Example: I would like to add player_two, player_three through python.

{
  "players": {
    "player_one": {
      "name": "Bob",
      "age": "0",
      "email": "bob@example.com"
    }
  }
}

How can I achieve doing this through python?

What I've tried:

with open("/var/www/html/api/toons/details.json", 'w') as outfile:
                json.dump(avatarDetails, outfile)

Answer 1

Here is a simple example, read the file as a dict, update the dict, then use json.dumps() to get the json data:

import json

# open your jsonfile in read mode
with open('jsonfile') as f:
    # read the data as a dict use json.load()
    jsondata = json.load(f)

# add a new item into the dict
jsondata['players']['player_two'] = {'email': 'kevin@example.com', 'name': 'Kevin', 'age': '0'}

# open that file in write mode
with open('jsonfile', 'w') as f:
    # write the data into that file
    json.dump(jsondata, f, indent=4, sort_keys=True)

Now the file looks like:

{
    "players": {
        "player_one": {
            "age": "0",
            "email": "bob@example.com",
            "name": "Bob"
        },
        "player_two": {
            "age": "0",
            "email": "kevin@example.com",
            "name": "Kevin"
        }
    }
}

Answer 2

Assuming that your file contains this JSON:

{
  "players": {
    "player_one": {
      "name": "Bob",
      "age": "0",
      "email": "bob@example.com"
    }
  }
}

You can parse the data into a Python dictionary using json.load() :

with open('/var/www/html/api/toons/details.json') as f:
    data = json.load(f)

Add your new players:

data['players']['player_two'] = dict(name='Bobbie', age=100, email='b@blah.com')
data['players']['player_three'] = dict(name='Robert', age=22, email='robert@blah.com')

Then save it back to a file:

with open('/var/www/html/api/toons/details.json', 'w') as f:
    json.dump(data, f)