将新的键/值添加到 json 字典 python

Question

I have the following json data:

hostcreate = {
    "jsonrpc": "2.0",
    "method": "host.create",
    "params": {
        "host": "my_host",
        "port": 10050,
        "interfaces": [{
            "type": 1,
            "main": 1,
            "useip": 1,
            "ip": "10.100.200.200",
            "dns": "",
            "port": "10050"
        }],
        "groups": [{
            "groupid": 2
        }, {
            "groupid": 22
        }]
    },
    "auth": "byese31blahblah",
    "id": 1
}

I can update the values of existing keys with something like this:

hostcreate['params']['port'] = str(newhostport)

However, when I try to add a new key/value to the dictionary, I get an error:

    hostcreate['params']['groups'][count]['groupid'] = int(eachgroupid)
IndexError: list index out of range

I'm getting that error when the value of count is greater than the number of available slots for groupid . So in other words, right now, groupid has 2 slots, which I can update easily. But when I try to add a new key/value for groupid, I get the aforementioned error.

How can I resolve this?

UPDATE:

Here's the code (which isn't working):

    numofgroups = len(groupids.split(","))
    rnumofgroups = numofgroups - 1
    count = 0
    existinggids = len(hostcreate['params']['groups']) - 1
    while (count <= numofgroups):
        eachgroupid = groupids.split(",")[count]
        if count <= existinggids:
            count = count + 1
            hostcreate['params']['groups'][count]['groupid'] = int(eachgroupid)
        else:
            count = count + 1
            hostcreate['params'['groups'].append({
                'groupid':int(eachgroupid)
            })

every time I run this, it keeps complaining. can anyone spot what is wrong with my code?

Answer 1

您必须附加到列表hostcreate['params'['groups'].append({'groupid':int(eachgroupid)})

Answer 2

hostcreate['params']['groups'] is a list, so you need append to add new item to it:

hostcreate['params']['groups'].append({
    'groupid':  int(eachgroupid)
})

---

update :

You didn't provide a MVCE so I can only guess what you want to do. The code you added at the update part can indeed be rewritten to make it more pythonic:

hostceate["params"]["groups"] = [{"groupid": int(g)} for g in groupids.split(",")]

This replace the whole list, which I see you're trying to do as you initialized count to 0 before the while loop.

Answer 3

i would do something like

try:
    hostcreate['params']['groups'][count]['groupid'] = int(eachgroupid)

except:
    hostcreate['params']['groups'].append({})
    hostcreate['params']['groups'][count]['groupid'] = int(eachgroupid)

theres probably a more elegant work around, but this just appends an empty dict to the groups list so you can add the key:value to it