random - Enciphering and Deciphering by Shuffling in Python -

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i writing program enciphers (and decipher) given string.

the encipher function takes 2 arguments: string , seed value.

here have far:

def random_encipher(string,seed):    random.seed(seed)    alphabet = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]     #shuffle alphabet    random.shuffle(alphabet)     #assign index each letter in alphabet    letter in alphabet:        letter = ord(letter)-97

to sum up, i'm shuffling alphabet , assigning each letter number value ("a" = 0, "b" = 1, . . .)

here's need with:

i need string[0] printed alphabet[0] (which shuffled alphabet, therefore current seed value, alphabet[0] = "e").

but each letter of string, not 0 index.

maybe that?

>>> import random >>> def random_encipher(string,seed):    random.seed(seed)    alphabet = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]     #shuffle alphabet    random.shuffle(alphabet)     ciphers = []    #assign index each letter in alphabet    letter in string:        index = ord(letter)-97        cipher = alphabet[index]        ciphers.append(cipher)    return "".join(ciphers)  >>> random_encipher("foobar", 3) 'fwwqgc'

the point in using list, strings immutable, appending string requires string copied costly. appending list , merging elements @ end better choice (or use stringio).


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