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simple cipher exercise changed imports, modifed alphabet name

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Xevion
2019-07-24 21:32:04 -05:00
parent 52d101cf0a
commit c10c2e28e4
1 changed files with 8 additions and 14 deletions
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22
python/simple-cipher/simple_cipher.py
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@@ -1,32 +1,26 @@
from string import ascii_lowercase as alphabet from string import ascii_lowercase as abc
from pprint import PrettyPrinter from random import shuffle
import random
print = PrettyPrinter().pprint
class Cipher(object): class Cipher(object):
def __init__(self, key=None): def __init__(self, key=None):
if key: if key:
self.key = ''.join(dict.fromkeys(self.key)) # Key with repeated characters is completely useless self.key = ''.join(dict.fromkeys(self.key)) # Key with repeated characters is completely useless
elif not key: elif not key:
self.key = list(alphabet) self.key = list(abc)
random.shuffle(self.key) shuffle(self.key)
self.key = ''.join(self.key) self.key = ''.join(self.key)
key_values = [self.keyvalue(i) for i in range(len(self.key))] key_values = [self.keyvalue(i) for i in range(len(self.key))]
self.key_alphabets = [(alphabet[index:] + alphabet[: index]) for index in key_values] self.key_alphabets = [(abc[index:] + abc[: index]) for index in key_values]
def encode(self, text): def encode(self, text):
return ''.join(self.key_alphabets[index][alphabet.find(char)] return ''.join(self.key_alphabets[index][abc.find(char)]
for index, char in enumerate(text.lower())) for index, char in enumerate(text.lower()))
def decode(self, text): def decode(self, text):
return ''.join(alphabet[self.key_alphabets[index].find(char)] return ''.join(abc[self.key_alphabets[index].find(char)]
for index, char in enumerate(text.lower())) for index, char in enumerate(text.lower()))
# Gets the shifting value of the key at the index specified # Gets the shifting value of the key at the index specified
def keyvalue(self, index): def keyvalue(self, index):
return alphabet.find(self.key[index % len(self.key)]) return abc.find(self.key[index % len(self.key)])
random.seed(0)
c = Cipher()
print(c.decode(c.encode('Hello World')))