Caesar Cipher Python (Cifra de César)

caesarcipher.py

lista = [" ", "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","x","y","w","z"]

def encode(text, offset):
    encodedText = ""
    for i in range(len(text)):
        letterIndex = -1
        for a in range(len(lista)):
            if lista[a] == text[i]:
                letterIndex = a
        if letterIndex + offset > len(lista) + 1:
            resto = int(letterIndex + offset - (len(lista) + 1))
            encodedText += lista[resto]
        else :
            encodedText += lista[letterIndex + offset]
    return encodedText

def decode(text, offset):
    decodedText = ""
    for i in range(len(text)):
        letterIndex = 0
        for a in range(len(lista)):
            if lista[a] == text[i]:
                letterIndex = a
        decodedText += lista[letterIndex - offset]
    return decodedText