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Re: String manipulation in python..NEED HELP!!!!

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2012/12/10  <qbailey@ihets.org>:
> I need help with a program i am doing. it is a cryptography program. i am given a regular alphabet and a key. i need to use the user input and use the regular alphabet and use the corresponding letter in the key and that becomes the new letter. i have the basic code but need help with how to mainpulate the string to do the encryption/decryption. please help
>
> here is my code so far:
>
>
> """ crypto.py
>     Implements a simple substitution cypher
> """
>
> alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
> key =   "XPMGTDHLYONZBWEARKJUFSCIQV"
>
> def main():
>   keepGoing = True
>   while keepGoing:
>     response = menu()
>     if response == "1":
>       plain = raw_input("text to be encoded: ")
>       print encode(plain)
>     elif response == "2":
>       coded = raw_input("code to be decyphered: ")
>       print decode(coded)
>     elif response == "0":
>       print "Thanks for doing secret spy stuff with me."
>       keepGoing = False
>     else:
>       print "I don't know what you want to do..."
>
>
>
>
> i really need help on how to encrypt it im not sure how to go about doing that please help.
> --
> http://mail.python.org/mailman/listinfo/python-list


Hi,
if I understand correctly, for the data shown in the code, you may
probably use the translate method of the string (and the corresponding
maketrans method);
cf.:

python 2.7
>>> import string
>>> "ABCDEF...VWXYZ".translate(string.maketrans("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "XPMGTDHLYONZBWEARKJUFSCIQV"))
'XPMGTD...SCIQV'
>>>


python 3.2
>>> "ABCDEF...VWXYZ".translate("".maketrans("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "XPMGTDHLYONZBWEARKJUFSCIQV"))
'XPMGTD...SCIQV'
>>>

hth,
  vbr

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String manipulation in python..NEED HELP!!!! qbailey@ihets.org - 2012-12-10 14:38 -0800
  Re: String manipulation in python..NEED HELP!!!! John Gordon <gordon@panix.com> - 2012-12-10 22:59 +0000
    Re: String manipulation in python..NEED HELP!!!! Terry Reedy <tjreedy@udel.edu> - 2012-12-11 14:30 -0500
      Re: String manipulation in python..NEED HELP!!!! Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-12-11 15:52 -0500
        Re: String manipulation in python..NEED HELP!!!! Tim Delaney <timothy.c.delaney@gmail.com> - 2012-12-12 08:34 +1100
  Re: String manipulation in python..NEED HELP!!!! Vlastimil Brom <vlastimil.brom@gmail.com> - 2012-12-11 00:25 +0100
  Re: String manipulation in python..NEED HELP!!!! Chris Angelico <rosuav@gmail.com> - 2012-12-11 10:36 +1100
  Re: String manipulation in python..NEED HELP!!!! duncan smith <buzzard@invalid.invalid> - 2012-12-11 16:39 +0000
    Re: String manipulation in python..NEED HELP!!!! Peter Pearson <ppearson@nowhere.invalid> - 2012-12-11 22:21 +0000

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