decrypt.py

def decrypt(msg, MORSE_CODE_DICTIONARY):
    li1 = list(MORSE_CODE_DICTIONARY.keys())
    li2 = list(MORSE_CODE_DICTIONARY.values())
    dic = dict()
    for i, j in zip(li1, li2):
        dic[j] = i
    if msg[len(msg) - 1] == " ":
        msg = msg[:-1]
    wordlist = msg.split(" / ")
    LetterList = list()
    DecryptedMessage = list()
    for i in wordlist:
        Word = ""
        LetterList = i.split(" ")
        for j in LetterList:
            if j not in li2:
                print(j)
                DecryptedMessage.clear()
                DecryptedMessage.append('INVALID MORSE CODE!!')
                return DecryptedMessage
            Word = Word + dic[j]
        DecryptedMessage.append(Word)
        Word = ""
    return DecryptedMessage