The Column Method | Python Fiddle

code = {'A': 0, 'B': 1,'C': 2,'D': 3,
'E': 4,'F': 5,'G': 6,'H': 7,
'I': 8,'J': 9,'K': 10,'L': 11,
'M': 12,'N': 13,'O': 14,'P': 15,
'Q': 16,'R': 17,'S': 18,'T': 19,
'U': 20,'V': 21,'W': 22, 'X': 23,
'Y': 24,'Z': 25}

def encoder(message, key_word):
    
    columns = []
    rows = []
    matrix = []
    
    row_length = len(key_word)
    column_length = len(message) / len(key_word)
    t = row_length
    b = 0
    c = 0
    while c <= column_length:
        for a in message[b:t]:
            rows.append(a)
            print rows
        matrix.append(rows)
        #b += row_length
        #t = b + row_length
        c += 1
    print matrix

def encode_or_decode():
    
    encode_decode = raw_input("do you want to encode or decode? ")  #.ascii_lowercase
    message = raw_input("Enter message: ")#.ascii_uppercase
    key_word = raw_input("Enter key: ")#.ascii_uppercase

if encode_decode == "encode":
        encoder(message, key_word)
    if encode_decode == "decode":
        decoder(message, key_word)
    
encode_or_decode()

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