Python: Merge two lists of dictionaries

Question

Given two lists of dictionaries:

>>> lst1 = [{id: 1, x: \"one\"},{id: 2, x: \"two\"}]
>>> lst2 = [{id: 2, x: \"two\"}, {id: 3, x: \"three\"         


        

Answer 1

Perhaps the simplest option

result = {x['id']:x for x in lst1 + lst2}.values()

This keeps only unique ids in the list, not preserving the order though.

If the lists are really big, a more realistic solution would be to sort them by id and merge iteratively.