Das deutsche Python-Forum

Code: Alles auswählen

option = input ("Möchten Sie codieren (code) oder decodieren (decode) ?")

abc = list ("abcdefghijklmnopqrstuvwxyz")                          #abc als Liste

if option == "code"                                                                 #Option codieren
  text = input ("Geben Sie den zu  codierenden Text ein")   #Text eingeben  
  text = list(text)                                                                    #Text zur Liste machen
  
  code = input("Wie lautet der Schlüssel?")

  codeindex = 0
  index = 0

  for x in range [len (text)]:
     Buchstabe = abc.index (text(index))
     text (index) = buchstabe+code(codeindex)
     
     index = index+1
     codeindex = codeindex+1
     if codeindex == len (code)
         codeindex = 0
  print (.join(text))
  

Code: Alles auswählen

from itertools import cycle

def character_to_number(char):
    return ord(char) - ord('a')

def number_to_character(number):
    return chr(number % 26 + ord('a'))

def coder(text, code):
    result = []
    for char, code_char in zip(text, cycle(code)):
        char_number = character_to_number(char)
        code_number = character_to_number(code_char)
        result.append(number_to_character(char_number + code_number))
    return ''.join(result)


def main():
    print(coder('abcdefghi', 'abc'))

if __name__ == '__main__':
    main()

Code: Alles auswählen

import itertools

from string import ascii_lowercase as abc

def vigenere(string, key, encode):
    def new_index(a, b):
        if encode:
            n = abc.index(a) + abc.index(b)
        else:
            n = abc.index(a) - abc.index(b)
        return abc[n % 26]
    return ''.join(
        itertools.starmap(new_index, zip(string, itertools.cycle(key)))
    )


def encode(plaintext, key):
    return vigenere(plaintext, key, True)


def decode(ciphertext, key):
    return vigenere(ciphertext, key, False)