Is there a better way to create a list of values of a nested dictionary?

Question

I made a nested dictionary

d = {
    'first':{
        'key': 'A',
        'val': 1
    },
    'second':{
        'key': 'A',
        'val': 2
    },
    'third':{
        'key': 'B',
        'val': 5
    },
    'fourth':{
        'key': 'B',
        'val': 7
    }
}

Now suppose I wanted to create a list of values of the nested dictionaries with key being 'key'. What I mean by that is, I want a list of such manner:

L = ['A', 'A', 'B', 'B']

I managed to do it with the help of for loops and value() in this manner:

List = d.values()
L = []
for K in List:
    L.append(K['key'])
print(L)

Output:

['A', 'A', 'B', 'B']

but is there something cleaner out there?

Answer 1

You can just use a list comprehension

print([v['key'] for v in d.values()])

Answer 2

you can write like :

keys_list = [record['key'] for record in d.values()]

it will get the values that you mentioned in the output.