Morse em Python

import os

# You need to install the sox library (apt-get install sox)
def bell(duration, frequency):
	os.system('play --no-show-progress --null --channels 1 synth %s sine %f' % (duration, frequency))	

morseAlphabet ={
	"A" : ".-",
    "B" : "-...",
    "C" : "-.-.",
    "D" : "-..",
    "E" : ".",
    "F" : "..-.",
    "G" : "--.",
    "H" : "....",
    "I" : "..",
    "J" : ".---",
    "K" : "-.-",
    "L" : ".-..",
    "M" : "--",
    "N" : "-.",
    "O" : "---",
    "P" : ".--.",
    "Q" : "--.-",
    "R" : ".-.",
    "S" : "...",
    "T" : "-",
    "U" : "..-",
    "V" : "...-",
    "W" : ".--",
    "X" : "-..-",
    "Y" : "-.--",
    "Z" : "--..",
    " " : "/"       
}

inverseMorseAlphabet=dict((v,k) for (k,v) in morseAlphabet.items())

def encodeToMorse(message):
	encodedMessage=""
	for char in message[:]:
		encodedMessage += morseAlphabet[char.upper()] + " "
	return encodedMessage

def bellMorseMessage(morse):
	for char in morse[:]:
		if(char == "."):
			bell(0.3,440)
		elif (char == "-"):
			bell(0.789,220)

def main():
	msg = raw_input("Write your message: ")
	morse = encodeToMorse(msg)
	bellMorseMessage(morse)

if __name__ == "__main__":
	main()