add new key/value to json dictionary 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?

well group is a list with 2 elements if you want to add a new element you have to appended you can not access index 2 until the are 3 elements and so on. — Carlos Gonzalez
– Carlos Gonzalez, Commented Mar 14, 2019 at 15:51
This is because hostcreate['params']['groups'] is a LIST!! you have to append hostcreate['params']['groups'].append({"groupid": int(eachgroupid)} or overwrite some item accesing by index — Wonka
– Wonka, Commented Mar 14, 2019 at 15:53

Alexandru Martin · Accepted Answer · 2019-03-14 15:52:40Z

1

You have to append to the list hostcreate['params'['groups'].append({'groupid':int(eachgroupid)})

answered Mar 14, 2019 at 15:52

Alexandru Martin

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adrtam · Accepted Answer · 2019-03-14 18:17:40Z

0

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.

edited Mar 14, 2019 at 18:17

answered Mar 14, 2019 at 15:52

adrtam

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2 Comments

KLZY Over a year ago

I updated my original post. can you see what I'm doing wrong with the code I posted?

KLZY Over a year ago

I implemented your update and it worked. Thank you!

SuperStew · Accepted Answer · 2019-03-14 15:52:53Z

0

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

answered Mar 14, 2019 at 15:52

SuperStew

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