>>> replace each letter in 'ABCDEFG' with the corresponding NATO Phonetic alphabet code

- elapsed 0.844 seconds -
d = {'A': 'Alpha', 'B': 'Bravo', 'C': 'Charlie', 'D': 'Delta', 'E': 'Echo',
    'F': 'Foxtrot', 'G': 'Golf'}
l = 'ABCDEFG'
[d.get(c) for c in l]