Adding Key and Value inside a list of lists python

Question

I have data that looks like this [[{'title': 'Line'}], [{'title': 'asd'}]]. I want to add a new key and value for every list inside of lists.

I have tried this but I'm having an error 'list' object is not a mapping. Any suggestion?

data = [[{'title': 'Line'}], [{'title': 'asd'}]]
titleID = [{'id': 373}, {'id': 374}]
combine = [{**dict_1, **dict_2}
           for dict_1, dict_2 in zip(char_id, data )]

the output I want is like this:

[[{'id': 373, 'title': 'Line'}], [{'id': 374, 'title': 'asd'}]]

what's your expected output

Deepak Tripathi
– Deepak Tripathi

2022-10-31 07:53:22 +00:00
Commented Oct 31, 2022 at 7:53 — Deepak Tripathi
– Deepak Tripathi, Commented Oct 31, 2022 at 7:53

Deepak Tripathi · Accepted Answer · 2022-10-31 07:54:55Z

1

Try this list comphrehension and unpacking

data = [[{'title': 'Line'}], [{'title': 'asd'}]]
titleID = [{'id': 373}, {'id': 374}]
[[{**i[0], **j}] for i,j in zip(data, titleID)]

Output

[[{'title': 'Line', 'id': 373}], [{'title': 'asd', 'id': 374}]]

answered Oct 31, 2022 at 7:54

Deepak Tripathi

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Comments

Anjaan · Accepted Answer · 2022-10-31 07:58:26Z

1

You can use list comprehension for a one-liner:

[[{**dict_1[0], **dict_2}] for dict_1, dict_2 in zip(data, titleID)]

answered Oct 31, 2022 at 7:58

Anjaan

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Boseong Choi · Accepted Answer · 2022-10-31 07:58:43Z

1

Because the elements of data are not dictionaries, but lists. You can directly unpack nested iterable structures. See target_list for more details.

data = [[{'title': 'Line'}], [{'title': 'asd'}]]
titleID = [{'id': 373}, {'id': 374}]

print([[{**dict1, **dict2}] for [dict1], dict2 in zip(data, titleID)])

will work. output:

[[{'title': 'Line', 'id': 373}], [{'title': 'asd', 'id': 374}]]

And if you are using Python 3.9+, you can use | operator for combining dictionaries.

print([[dict1 | dict2] for [dict1], dict2 in zip(data, titleID)])

answered Oct 31, 2022 at 7:58

Boseong Choi

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