Vernam cipher

# Vernam cipher
# an implementation devised by Gilbert Vernam in the early 1900s

#-- ------------
def cipherVernam( key="", txt=""):
    """ return a sequence of ASCII codepoints (tuple of ints)"""
    #
    lenTxt = len(txt)
    if ( lenTxt == 0 or len(key) < lenTxt ) : return () # empty tuple
    #    -----------    -----------------
    # get a list of ints (ASCII codepoints) for pad and text
    #
    keyOrds = [ ord(c) for c in key ]  # assume key (pad value) is given as a String (for demo)
    #
    if ( isinstance( txt, str )) :
        #
        txtOrds = [ ord(c) for c in txt ]  # map String to list of integer ordinals (codepoints)
    else:
        txtOrds = txt                      # else .. already a list of (codepoint) integers
    #------------------
    print( key,':', txt )         # DEBUG .. REMOVE !
    print( keyOrds,':', txtOrds ) # DEBUG .. REMOVE !
    #---------
    # map text using XOR
    vOrds = []
    for x in range( lenTxt ) :
        #
        vOrds.append( keyOrds[x] ^ txtOrds[x] ) # ^ is XOR
    #
    return tuple( vOrds )
#
#-- ----------------
def showVernamRESULT( ordSequence ) :
    print( 'OUTPUT follows ..')
    print( 'DECIMAL ..')
    print( ordSequence )

    print( 'BINARY ..')
    resChars = [ bin(n) for n in ordSequence ]
    print( ",".join(resChars))

    print( 'HEX ..')
    resChars = [ hex(n) for n in ordSequence ]
    print( ",".join(resChars))

    print( 'ASCII ..')
    resChars = [ ascii(chr(n)) for n in ordSequence ]
    print( ",".join(resChars))

    print( 'TEXT with non-printables excluded ..')
    resChars = []
    for thisOrd in ordSequence :
        if ( thisOrd >= 32 and thisOrd < 127 ) : resChars.append( chr( thisOrd ))
    #
    print( "".join(resChars))  # make a String of it
#-----------------
# TEST calls ..
print('-----------------------------------------------------------------')
result = cipherVernam('GRWF', 'MEET' )
showVernamRESULT( result )
print('-----------------------------------------------------------------')
result = cipherVernam('KTLZCPMYGNVED', [15, 1, 24, 25, 11, 22, 4, 11, 2, 12, 31, 23, 0])
showVernamRESULT( result )
print('-----------------------------------------------------------------')
result = cipherVernam('LBMBTC', [31,10,12,12,0,2] )
showVernamRESULT( result )
print('-----------------------------------------------------------------')
result = cipherVernam('0123456789', 'ROCKPYTHON' )
showVernamRESULT( result )
print('-----------------------------------------------------------------')
result = cipherVernam('0123456789', (98, 126, 113, 120, 100, 108, 98, 127, 119, 119) )
showVernamRESULT( result )
print('-----------------------------------------------------------------')
result = cipherVernam('CMGLNYHUJLYGNVEDLFJ', 'OKTLZCPMVLRZUZA' )
showVernamRESULT( result )
print('-----------------------------------------------------------------')
#result = cipherVernam('GOOD', [71,82,87,70] )
result = cipherVernam('GOOD', [ 0b1000111, 0b1010010, 0b1010111, 0b1000110 ] )
showVernamRESULT( result )
print('-----------------------------------------------------------------')