Sorry, I just realize my question are wrong: I want to knowhow to do dictionary of dictionary in most python way: diz = { "A"={"e"=2,"s"=10},"B"={"e"=20,"s"=7}} So I have some keys (A,B) is correlate with a new dictionary where I have other key I want to use. I want to extract for each key the "e" value. thanks