Contents

from string import ascii_lowercase
from time import time
import random


class Cipher(object):

    def __init__(self, key=None):
        if not key:
            random.seed(time())
            key = ''.join(random.choice(ascii_lowercase) for i in range(100))
        elif not key.isalpha() or not key.islower():
            raise ValueError('Wrong key parameter!')
        self.key = key

    def encode(self, text):
        text = ''.join(c for c in text if c.isalpha()).lower()
        key = self.key * (len(text) // len(self.key) + 1)
        return ''.join(chr((ord(c) - 194 + ord(k)) % 26 + 97)
                       for c, k in zip(text, key))

    def decode(self, text):
        key = self.key * (len(text) // len(self.key) + 1)
        return ''.join(chr((ord(c) - ord(k) + 26) % 26 + 97)
                       for c, k in zip(text, key))


class Caesar(Cipher):

    def __init__(self):
        Cipher.__init__(self, 'd')

Version data entries

262 entries across 262 versions & 1 rubygems

Version	Path
trackler-2.2.1.164	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.163	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.162	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.161	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.160	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.159	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.158	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.157	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.156	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.155	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.154	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.153	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.152	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.151	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.150	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.149	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.148	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.147	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.146	tracks/python/exercises/simple-cipher/example.py
trackler-2.2.1.145	tracks/python/exercises/simple-cipher/example.py