[Tutor] syntax error help

[Awais Mamoon]

Hi my code should be working however keeps coming up with invalid syntax but
I know there isn’t one. Please help me its been 2 hours

Here is my code:

alphabet = 'abcdefghijklmnaopqrstuvwxyz'

             

#gets the message from the user so it can Encrypt or Decrypt

def getMessage():

     print('Enter your message:')

     return input()

    

#gets the key from the use so it can Encrypt or Decrypt the chosen message

def getKey():

    while True:

        print("please enter your keyword")

        Keyword = input()

        valid_Keyword = True

        for letter in Keyword:

            if (letter not in alphabet) and (letter != " "):

                valid_Keyword = False

        if valid_Keyword == False:

            print("you need to enter a valid keyword")

        if valid_Keyword == True:

            return Keyword

 

def EncryptionOrDecryption(plaintext_message, Keyword):

     NewLetter = ("")

     Ciphertext = ("")

     PositionKeyword = 0

     print('Do you wish to encrypt or decrypt')

     option = input()

     if option == "e" or "encrypt":

          for i in plaintext_message:

               if i == "":

                    Ciphertext = Ciphertext + ""

               else:

                    NewLetter = (alphabet.index(i)+1) +
alphabet.index(Keyword[PositionKeyword]

                    PositionKeyword = PositionKeyword + 1

                    if PositionKeyword == len(Keyword):

                         PositionKeyword = 0

                    if NewLetter > 25:

                        NewLetter = NewLetter - 26

                   Ciphertext = Ciphertext + alphabet[NewLetter]

     return Ciphertext

     elif option == "d" or "decrypt":

           for i in plaintext_message:

               if i == "":

                    Ciphertext = Ciphertext + ""

               else:

                    NewLetter = (alphabet.index(i)-1) +
alphabet.index(Keyword[PositionKeyword])

                    PositionKeyword = Keyword + 1

                    if PositionKeyword == len(Keyword):

                         PositionKeyword = 0

                    if NewLetter > 25:

                         NewLetter = NewLetter - 26

               Ciphertext = Ciphertext + alphabet[NewLetter]

     return Ciphertext

 

 

#this makes the code abit more efficient

plaintext_message = getMessage()

Keyword = getKey()

Ciphertext = EncryptionOrDecryption(plaintext_message, Keyword)

 

#displays the Encyrpted/Decrypted message to the user 

print('Your translated text is:')

print(Ciphertext)