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Samuel F. B. Morse's Code (Python recipe) by Stephen Chappell
ActiveState Code (http://code.activestate.com/recipes/578364/)

Many people have heard of Morse['s] Code, and it still is a helpful skill to have in certain context, as advanced as technology has become. The following recipe shows two sample ways that it can be implemented and shows some diversity in how problems can be solved in Python or many other languages for that matter.

Python, 171 lines
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#################
# Morse Code 1.py
#################

import sys
import time
import winsound

DOT = 0.1
DASH = DOT * 3

BETWEEN_PARTS = DOT * 1
BETWEEN_LETTERS = DOT * 3
BETWEEN_WORDS = DOT * 7

CODE = {'A': [DOT, DASH],
        'B': [DASH, DOT, DOT, DOT],
        'C': [DASH, DOT, DASH, DOT],
        'D': [DASH, DOT, DOT],
        'E': [DOT],
        'F': [DOT, DOT, DASH, DOT],
        'G': [DASH, DASH, DOT],
        'H': [DOT, DOT, DOT, DOT],
        'I': [DOT, DOT],
        'J': [DOT, DASH, DASH, DASH],
        'K': [DASH, DOT, DASH],
        'L': [DOT, DASH, DOT, DOT],
        'M': [DASH, DASH],
        'N': [DASH, DOT],
        'O': [DASH, DASH, DASH],
        'P': [DOT, DASH, DASH, DOT],
        'Q': [DASH, DASH, DOT, DASH],
        'R': [DOT, DASH, DOT],
        'S': [DOT, DOT, DOT],
        'T': [DASH],
        'U': [DOT, DOT, DASH],
        'V': [DOT, DOT, DOT, DASH],
        'W': [DOT, DASH, DASH],
        'X': [DASH, DOT, DOT, DASH],
        'Y': [DASH, DOT, DASH, DASH],
        'Z': [DASH, DASH, DOT, DOT],
        '1': [DOT, DASH, DASH, DASH, DASH],
        '2': [DOT, DOT, DASH, DASH, DASH],
        '3': [DOT, DOT, DOT, DASH, DASH],
        '4': [DOT, DOT, DOT, DOT, DASH],
        '5': [DOT, DOT, DOT, DOT, DOT],
        '6': [DASH, DOT, DOT, DOT, DOT],
        '7': [DASH, DASH, DOT, DOT, DOT],
        '8': [DASH, DASH, DASH, DOT, DOT],
        '9': [DASH, DASH, DASH, DASH, DOT],
        '0': [DASH, DASH, DASH, DASH, DASH],
        '.': [DOT, DASH, DOT, DASH, DOT, DASH],
        ',': [DASH, DASH, DOT, DOT, DASH, DASH],
        '?': [DOT, DOT, DASH, DASH, DOT, DOT],
        '/': [DASH, DOT, DOT, DASH, DOT],
        '@': [DOT, DASH, DASH, DOT, DASH, DOT]}

def translate(string):
    for character in string.upper():
        if CODE.has_key(character):
            for interval in CODE[character]:
                winsound.Beep(440, int(interval * 1000))
                time.sleep(BETWEEN_PARTS)
            time.sleep(BETWEEN_LETTERS - BETWEEN_PARTS)
            sys.stdout.write(character)
        else:
            time.sleep(BETWEEN_WORDS - BETWEEN_LETTERS)
            sys.stdout.write(' ')

def test():
    line = sys.stdin.readline()
    while line:
        translate(line)
        sys.stdout.write('\n')
        line = sys.stdin.readline()

if __name__ == '__main__':
    test()

#################
# Morse Code 2.py
#################

from sys import *
from time import *
from winsound import *

################################################################################

FQC = 880
DOT = 0.1

################################################################################

DAH = DOT * 3
SEP = DOT * 7

CODE = {' ': ' ',
        "'": '.----.',
        '(': '-.--.-',
        ')': '-.--.-',
        ',': '--..--',
        '-': '-....-',
        '.': '.-.-.-',
        '/': '-..-.',
        '0': '-----',
        '1': '.----',
        '2': '..---',
        '3': '...--',
        '4': '....-',
        '5': '.....',
        '6': '-....',
        '7': '--...',
        '8': '---..',
        '9': '----.',
        ':': '---...',
        ';': '-.-.-.',
        '?': '..--..',
        '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': '--..',
        '_': '..--.-'}

################################################################################

def main():
    s = stdin.readline()
    while s:
        translate(s)
        s = stdin.readline()
    
def translate(s):
    s = ''.join(c for c in s.upper() if c in CODE)
    for i, c in enumerate(s):
        if c == ' ':
            sleep(SEP)
        else:
            for d in CODE[c][:-1]:
                Beep(FQC, int((DOT if d == '.' else DAH) * 1000))
                sleep(DOT)
            Beep(FQC, int((DOT if CODE[c][-1] == '.' else DAH) * 1000))
            if i + 1 != len(s) and s[i + 1] != ' ':
                sleep(DAH)

################################################################################
                
if __name__ == '__main__':
    main()
Tags: code, demonstration, morse, morse_code, morse_practice_oscillator, sound