Modified Atbash Cipher code in Python

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The Atbash cipher is a very specific case of a Monoalphabetic substitution cipher where the letters of the alphabet are reversed. In other words, all A's are replaced with Z's, all B's are replaced with Y's, and so on. 

I modified this general scheme somewhat and added support for encrypting digits and special characters too to make it stronger because reversing the alphabet twice will get you actual alphabet, you can encipher and decipher a message using the exact same algorithm.

Example:

Plaintext  : Ex094, You are a very Nice Guy!

Ciphertext: [liZeB?~uo?8r4?8?n4rk?_064?-okX

class AtBash:

   def __init__(self):
       self.alphabets = ' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789~!@#$%^&*()_+|:"<>-=[];,.?/`'

   def encode(self, plaintext):
       cipher = ""
       for i in plaintext:
           index = self.alphabets.index(i)
           cipher += self.alphabets[abs(len(self.alphabets) - index - 1) % len(self.alphabets)]
       return cipher

   def decode(self, ciphertext):
       return self.encode(ciphertext)


if __name__ == "__main__":
   atbash = AtBash()

   enc = atbash.encode("Hello World!")
   print(enc)

   dec = atbash.decode(enc)
   print(dec)

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