atbash.py

from itertools import izip
import string

class Atbash:
	def __construct(self):
		self.atbash_abc = zip(string.ascii_lowercase, string.ascii_lowercase[::-1])
		self.atbash_abc_enc = {p[1]:p[0] for p in atbash_abc}
		self.atbash_abc_dec = {p[0]:p[1] for p in atbash_abc}
	def enc(self, s):
		return "".join([atbash_abc_enc[c] if c in atbash_abc_enc else c for c in s.lower()])
	def dec(self, s):
		return "".join([atbash_abc_dec[c] if c in atbash_abc_dec else c or " " for c in s.lower()])