Combine 2 lists of dict in one list of dict

Question

In python3 I have 2 lists:

listA = [{'aString': 'someone', 'aNumber': 123}]
listB = [{'anotherNumber': 456}]

How do I combine them into 1 single list which looks like this?

listC = [{'aString': 'someone', 'aNumber': 123, 'anotherNumber': 456}]

If I use,

listC = listA + listB

I get:

listC = [{'aString': 'someone', 'aNumber': 123}, {'anotherNumber': 456}]

Possible duplicate of [How to merge two dictionaries in a single expression?](https://stackoverflow.com/questions/38987/how-to-merge-two-dictionaries-in-a-single-expression) — Chris, Feb 26 '19 at 13:14
you don't actually look for merging lists but merging dictionaries in lists. you can merge dictionaries with dict.update(). — Tryph, Feb 26 '19 at 13:15

score 3 · Accepted Answer · answered Feb 26 '19 at 13:17

3

You can unpack the two lists into the dict constructor and then unpack the two dicts into one:

[{**dict(*listA), **dict(*listB)}]

answered Feb 26 '19 at 13:17

blhsing

just to mention... it's only going to work in python 3 – raphael Feb 26 '19 at 13:18
2

Right (generic unpacking is available since Python 3.5 to be precise). The OP does tag the question with python-3.7. – blhsing Feb 26 '19 at 13:20

score 0 · Answer 2 · answered Feb 26 '19 at 13:18

0

Try using :

listC = dict(listA .items() + listB.items())

answered Feb 26 '19 at 13:18

Smaiil

his answer came in Low Quality posts in SO since its code only answer.... Could you add any commentary to your answer? Explain your logic, and give a little commentary on what your code is intended to do. This will help the OP, but it will also serve as commentary for future users – Ram Ghadiyaram Feb 26 '19 at 20:00

2 Answers2