Encrypt/Decrypt function

## My take on an encrypt/decrypt function



# Function to encrypt/decrypt a file
def crypt(File2):
    # Encrypt keys. Must be the same length and not contain values from each other
    Alphabet    = 'abcdefghijklmnopqrstuvwxyz'
    EncAlphabet = '1*2/3-4%5<6!7+8$9^0=&,`." '

    # List to hold the en/decrypted file
    EncList = []

    # Loop through each letter in our file. If the letter is one key, find the position in the key and
    # get the character at the same position in the other key and add it to our List. If the character
    # is not in our key, then just copy it over.
    for letter in File2:
        if letter in Alphabet:
            index = Alphabet.index(letter)
            EncLetter = EncAlphabet[index]
            EncList.append(EncLetter)
        elif letter in EncAlphabet:
            index = EncAlphabet.index(letter)
            EncLetter = Alphabet[index]
            EncList.append(EncLetter)
        else:
            EncList.append(letter)

    # Convert our list to a string and return it
    Cryptstring = "".join(EncList)
    return Cryptstring