Merge List of Dictionaries into a Single List

Question

I have a list of dictionaries that all follow the same format. I want to alter the list of dictionaries to return just the values from all the objects like so.

[{"name": "Dwight"}, {"name": "Michael"}, {"name": "Jim"}] -> ["Dwight", "Michael", "Jim"]

I realize I can iterate through the list and grab the values from each object, but I was wondering if there’s any easier/built in python way to do it. Any suggestions?

Asked By: Phil Cho

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Source

Answer 1

You can hardly beat an explicit list comprehension:

[v for d in my_list for v in d.values()]

or maybe you meant

[d['name'] for d in my_list if 'name' in d]

Answered By: YvesgereY

Answer 2

If you mean by iterating through a dictionary and building a list, then you probably meant that you already know to do this:

dictionaries_in_list = [{"name": "Dwight"}, {"name": "Michael"}, {"name": "Jim"}]
list = []

for dictionary in dictionaries_in_list:
    list.append(dictionary['name'])

print(list)

This is a legitimate pythonic way to express code. Are you asking for a one-liner instead of a two-liner? @It_is_Chris comment is a valid one-line solution.

dictionaries_in_list = [{"name": "Dwight"}, {"name": "Michael"}, {"name": "Jim"}]

it_is_christ_solution = [d['name'] for d in dictionaries_in_list]

print(it_is_christ_solution)

Both of @YvesgereY’s are valid one-liners, too.

Answered By: Registered User

Merge List of Dictionaries into a Single List

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