atbash, robot simulator, sum of multiples exercises

python/atbash-cipher/atbash_cipher.py

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+from string import ascii_letters, punctuation, whitespace
+
+rev = ascii_letters[25::-1] + ascii_letters[:25:-1]
+enc = str.maketrans(ascii_letters, rev)
+dec = str.maketrans(rev, ascii_letters)
+san = str.maketrans('', '', punctuation)
+
+def groupings(text, groupby=5):
+    for i in range(0, len(text), groupby):
+        yield  text[i:i + groupby]
+
+def sanitize(text):
+    return ''.join(text.translate(san).split())
+
+def encode(plain_text):
+    return ' '.join(groupings(sanitize(plain_text.translate(enc).lower())))
+
+def decode(ciphered_text):
+    return ''.join(ciphered_text.translate(dec).lower().split())