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"""

Program to encode and decode Baconian or Bacon's Cipher

Wikipedia reference : https://en.wikipedia.org/wiki/Bacon%27s_cipher

"""

encode_dict = {

"a": "AAAAA",

"b": "AAAAB",

"c": "AAABA",

"d": "AAABB",

"e": "AABAA",

"f": "AABAB",

"g": "AABBA",

"h": "AABBB",

"i": "ABAAA",

"j": "BBBAA",

"k": "ABAAB",

"l": "ABABA",

"m": "ABABB",

"n": "ABBAA",

"o": "ABBAB",

"p": "ABBBA",

"q": "ABBBB",

"r": "BAAAA",

"s": "BAAAB",

"t": "BAABA",

"u": "BAABB",

"v": "BBBAB",

"w": "BABAA",

"x": "BABAB",

"y": "BABBA",

"z": "BABBB",

" ": " ",

}

decode_dict = {value: key for key, value in encode_dict.items()}

def encode(word: str) -> str:

"""

Encodes to Baconian cipher

>>> encode("hello")

'AABBBAABAAABABAABABAABBAB'

>>> encode("hello world")

'AABBBAABAAABABAABABAABBAB BABAAABBABBAAAAABABAAAABB'

>>> encode("hello world!")

Traceback (most recent call last):

...

Exception: encode() accepts only letters of the alphabet and spaces

"""

encoded = ""

for letter in word.lower():

if letter.isalpha() or letter == " ":

encoded += encode_dict[letter]

else:

raise Exception("encode() accepts only letters of the alphabet and spaces")

return encoded

def decode(coded: str) -> str:

"""

Decodes from Baconian cipher

>>> decode("AABBBAABAAABABAABABAABBAB BABAAABBABBAAAAABABAAAABB")

'hello world'

>>> decode("AABBBAABAAABABAABABAABBAB")

'hello'

>>> decode("AABBBAABAAABABAABABAABBAB BABAAABBABBAAAAABABAAAABB!")

Traceback (most recent call last):

...

Exception: decode() accepts only 'A', 'B' and spaces

"""

if set(coded) - {"A", "B", " "} != set():

raise Exception("decode() accepts only 'A', 'B' and spaces")

decoded = ""

for word in coded.split():

while len(word) != 0:

decoded += decode_dict[word[:5]]

word = word[5:]

decoded += " "

return decoded.strip()

if __name__ == "__main__":

from doctest import testmod

testmod()

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