How to get from the dictionary in which the dictionary and get the value from the 2 nested dictionaries by key?

Question

Python

car = {
    '321': [
        {'audi': 3, 'BMW': 4},
    ]

You need to get 4
If there are many similar lists and you need to add up, let's say all the values ​​\u200b\u200bthat with the key 'BMW': 4 can this be done through a loop?
PS I apologize if I called something wrong.

Answer 1

it is possible through a loop
but pythonists use List Comprehensions
to get it simply
car['321'][0]['BMW']