Add an element in each dictionary of a list (list comprehension)

Question

I have a list of dictionaries, and want to add a key for each element of this list. I tried:

result = [ item.update({\"elem\":\"value\"}) for item in mylist          


        

Answer 1

Either do not use a list comprehension, or return a new dict based on the original dict plus the new key:

[dict(list(item.items()) + [("elem", "value")]) for item in mylist]