How to sum of inner values of a each key in dictionary

Question

d={ "BMW":{"black":5, "white":2}, "Benz":{"black":2, "blue":1}}
how to sum of cars and output be:
BMW: 7
Benz: 3

Answer 1

Something like this:

for k,v in d.items():
print k + ': ' + str(sum(v.values()))

Answer 2

thank you