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README.me
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Codewars
Aufgabe 1 Snail: https://www.codewars.com/kata/521c2db8ddc89b9b7a0000c1
Aufgabe 2 Vigenère Cipher Helper: https://www.codewars.com/kata/52d1bd3694d26f8d6e0000d3

65
src/codewars/vigenere_cipher_helper.py
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class VigenereCipher(object):
def __init__(self, key, alphabet):
self.key = key
self.alphabet = alphabet
def encode(self, text):
key = (self.key * ((len(text) // len(self.key)) + 1))[: len(text)]
result = []
idx = 0
for text_char in text:
if text_char not in self.alphabet:
result.append(text_char)
idx += 1
elif (
self.alphabet.index(text_char) + self.alphabet.index(key[idx])
<= len(self.alphabet) - 1
):
result.append(
self.alphabet[
self.alphabet.index(text_char) + self.alphabet.index(key[idx])
]
)
idx += 1
else:
result.append(
self.alphabet[
self.alphabet.index(text_char)
+ self.alphabet.index(key[idx])
- len(self.alphabet)
]
)
idx += 1
return "".join(result)
def decode(self, text):
key = (self.key * ((len(text) // len(self.key)) + 1))[: len(text)]
result = []
idx = 0
for text_char in text:
if text_char not in self.alphabet:
result.append(text_char)
idx += 1
elif self.alphabet.index(text_char) - self.alphabet.index(key[idx]) >= 0:
result.append(
self.alphabet[
self.alphabet.index(text_char) - self.alphabet.index(key[idx])
]
)
idx += 1
else:
result.append(
self.alphabet[
self.alphabet.index(text_char)
- self.alphabet.index(key[idx])
+ len(self.alphabet)
]
)
idx += 1
return "".join(result)