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"""
Lösung des Katas: Caesar Cipher Helper
Link: https://www.codewars.com/kata/526d42b6526963598d0004db
"""
beginning_alphabet = ord("A")
ending_alphabet = ord("Z")
class CaesarCipher(object):
def __init__(self, offset):
self.offset = offset
def encode(self, st):
upper = st.upper()
encoded_st = ""
for char in upper:
if beginning_alphabet <= ord(char) <= ending_alphabet:
encoded_char = (ord(char) + self.offset)
if encoded_char > ending_alphabet:
encoded_char -= (ending_alphabet - (beginning_alphabet - 1))
encoded_st += chr(encoded_char)
else:
encoded_st += char
return encoded_st
def decode(self, st):
decoded_st = ""
for char in st:
if beginning_alphabet <= ord(char) <= ending_alphabet:
decoded_char = (ord(char) - self.offset)
if decoded_char < beginning_alphabet:
decoded_char += (ending_alphabet - (beginning_alphabet - 1))
decoded_st += chr(decoded_char)
else:
decoded_st += char
return decoded_st