Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.000
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'subject:: [': 0.03; 'binary': 0.05; 'character,': 0.07; '32-bit': 0.09; 'backwards': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'def': 0.10; 'advance.': 0.15; 'encoding': 0.15; '8-bit': 0.16; 'integer.': 0.16; 'message-id:@dough.gmane.org': 0.16; 'received:173.11': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'subject:String': 0.16; 'string': 0.17; 'integer': 0.17; 'subject:] ': 0.19; 'skip:v 30': 0.20; 'header:In-Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.28; 'skip:_ 10': 0.29; 'could': 0.32; 'print': 0.32; 'skip:s 30': 0.33; 'to:addr:python-list': 0.33; 'thanks': 0.34; 'there': 0.35; 'received:org': 0.36; 'skip:v 20': 0.37; 'to:addr:python.org': 0.39; 'header:Received:5': 0.40; 'easy': 0.60
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Emile van Sebille <emile@fenx.com>
Subject: Re: [newbie] String to binary conversion
Date: Mon, 06 Aug 2012 15:45:50 -0700
References: <jvpafd$vig$1@news.albasani.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: 173-11-108-137-sfba.hfc.comcastbusiness.net
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120713 Thunderbird/14.0
In-Reply-To: <jvpafd$vig$1@news.albasani.net>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.3038.1344293171.4697.python-list@python.org>
Lines: 29
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1344293171 news.xs4all.nl 6988 [2001:888:2000:d::a6]:35650
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:26668

On 8/6/2012 1:46 PM Mok-Kong Shen said...
>
> If I have a string "abcd" then, with 8-bit encoding of each character,
> there is a corresponding 32-bit binary integer. How could I best
> obtain that integer and from that integer backwards again obtain the
> original string? Thanks in advance.

It's easy to write one:

def str2val(str,_val=0):
     if len(str)>1: return str2val(str[1:],256*_val+ord(str[0]))
     return 256*_val+ord(str[0])


def val2str(val,_str=""):
     if val>256: return val2str(int(val/256),_str)+chr(val%256)
     return _str+chr(val)


print str2val("abcd")
print val2str(str2val("abcd"))
print val2str(str2val("good"))
print val2str(str2val("longer"))
print val2str(str2val("verymuchlonger"))

Flavor to taste.

Emile