what is the format for a python json file? code example

Example 1: json dump to file

import json

data = {"key": "value"}

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

Example 2: write json pythonb

>>> jstr = json.dumps(data, ensure_ascii=False, indent=4)
>>> print(jstr)
{
    "item": "Beer",
    "cost": "£4.00"
}