Python - Alfabeto fonetico

def foneticWord(word):

    if (isinstance(word, str)):

        alfb_fon = {'A':'Alpha', 'B':'Bravo', 'C':'Charlie',

                    'D':'Delta', 'E':'Echo', 'F':'Foxtrot',

                    'G':'Golf', 'H':'Hotel', 'I':'India',

                    'J':'Juliet', 'K':'Kilo', 'L':'Lima',

                    'M':'Mike', 'N':'November', 'O':'Oscar',

                    'P':'Papa', 'Q':'Quebec', 'R':'Romeo',

                    'S':'Sierra', 'T':'Tango', 'U':'Uniform',

                    'V':'Victor', 'W':'Whiskey', 'X':'X-ray',

                    'Y':'Yankee', 'Z':'Zulu'}

        word_fon = ''

        for i in word:

            let = i.upper()

            if let in alfb_fon:

                word_fon += alfb_fon[let] + ' '

        return word_fon.strip()

print (foneticWord('Python'))