How to add object to json list?

Question

Python

I have this json:

{
    "items": [
        {
            "start_price": "5000",
            "end_price": "4750",
            "classid": "310781333",
            "instanceid": "302028390",
            "name": "P90 | Teardown (Field-Tested)"
        }
    ]
}

How can I make it so that new data is added to "items" and the past is not erased? For example:

{
    "items": [
        {
            "start_price": "5000",
            "end_price": "4750",
            "classid": "310781333",
            "instanceid": "302028390",
            "name": "P90 | Teardown (Field-Tested)"
        }
       {
            "start_price": "3000",
            "end_price": "2750",
            "classid": "310781533",
            "instanceid": "302015782",
            "name": "Souvenir MP5-SD | Lab Rats (Field-Tested)"
        }
    ]
}

Answer 1

d = json.loads(json_string)
d["items"].append({
    "start_price": "3000",
    "end_price": "2750",
    "classid": "310781533",
    "instanceid": "302015782",
    "name": "Souvenir MP5-SD | Lab Rats (Field-Tested)"
})
json_string = json.dumps(d)