如何在带有 if 语句的枚举 for 循环中使用索引（python）

Question

I have a nested dictionary, of which it is possible to access a value like this:

print(list['sublist'][0]['item'][0]['commentId'])

However if I create a for loop and would like to use the index like this it gives me a keyerror:

    for index,sublist in enumerate(list['sublist']):
        if sublist[index]['item'][0]['commentId'] == commentid:
            number = sublist[index]['item'][0]['positionId']
            username = sublist[index]['subListCreator']
    print(number)
    print(username)

The error:

, in send_async_notification
    if sublist[index]['item'][0]['commentId'] == commentid:
  File "/Users/ ...... /venv/lib/python3.8/site-packages/mongoengine/base/document.py", line 263, in __getitem__
    raise KeyError(name)

The whole goal of this exercise is to get two particular values in a nested array based on a deeper nested commentId. If there is a match, I would like to know the positionId and the subListCreator underneath it. An item can only have one commentId, hence the [0] in the code.

It would also be ok to just have the whole dictionary "branch" that matches the commentId, this would also make things work.

Btw, print(commentid) gives me the commentid I would like to match against. Just to explain its present.

Hope there's a solution here, wonder why it's not working. Looking forward to any answer!

Answer 1

Thanks Mathias for commenting: A double for-loop solves my problem:

    for sublist in list['sublist']:
        for item in sublist['item']:
            if item['commentId'] == commentid:
                number = item['positionId']
                username = sublist['subListCreator']