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djbacs
djbacs

Reputation: 51

Extract lists from a list of dictionaries

Basically I have this:

my_list = [{'a': 1, 'b': 1}, {'c': 1}]

And I want an output like this:

new_list = [['a', 'b'],['c']]

I tried my own code but it just returns this:

['a', 'b', 'c']

Upvotes: 3

Views: 68

Answers (2)

Abhishek Bhagate
Abhishek Bhagate

Reputation: 5766

You can easily do it like -

my_list = [{'a': 1, 'b': 1}, {'c': 1}]

res = list(map(list,my_list))

print(res)

OUTPUT :

[['a', 'b'], ['c']]

If you don't quite get how the above works, here's a simpler version to do the same -

my_list = [{'a': 1, 'b': 1}, {'c': 1}]

res = []
for dicts in my_list:
    res.append(list(dicts))    

# The above process is equivalent to the shorthand :
# res = [ list(dicts) for dicts in my_list ]

print(res)

OUTPUT :

[['a', 'b'], ['c']]

Upvotes: 2

Riccardo Bucco
Riccardo Bucco

Reputation: 15364

Here is a possible solution:

result = [list(d) for d in my_list]

It is basically equivalent to:

result = list(map(list, my_list))

Notice that using list(d.keys()) is equivalent to list(d).

As suggested by meowgoesthedog in a comment, be careful with Python versions older than 3.7: keys are not ordered, so you might end up having unsorted values.

Upvotes: 3

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