gets a word from the command line and decodes it using a ceasar cipher

ceasarCipher.py

import sys, string

def getDecodedLetter(encoded, n):
    position = string.ascii_lowercase.index(encoded)
    return string.ascii_lowercase[(position + n) % 26]

def getDecodedWord(word, n):
    decodedWord = ""
    for letter in word:
        decodedWord += getDecodedLetter(letter, n)
    return decodedWord

def iterateOver(word):
    for i in range(1,26):
        print(str(i) + " " + getDecodedWord(word, i))

if __name__ == "__main__":
    for word in sys.argv[1:]:
        print(word)
        iterateOver(word)