[Tutor] Decoding

[Eric Walker]

--- bhaaluu <bhaaluu at gmail.com> wrote:

> Greetings,
> 
> From what I can tell of this "decoding" function, it
> uses
> the chr() function to return the ascii character:
> 
> >>> print chr(eval('65'))
> A
> 
> >>> print ord('A')
> 65
> 
> In this textbook example, the "code" is simple a
> string of the
> ASCII characters' numeric values. Nothing fancy.
> 
> What does this 'coded' message decode to, using the
> dec function?
> 
> a = "72 101 108 108 111 32 69 114 105 99 33"
> 
> Happy Programming!
> -- 
> bhaaluu at gmail dot com
> 
> On 8/12/07, Eric Walker <sli1que at yahoo.com> wrote:
> > newbie here,
> > I just tried playing around with the dec function
> and
> > I get errors. Correct me if I am wrong. After
> getting
> > the input, the string.split will parse the string
> > across whitespace chars so in other words you get
> a
> > list of each word entered. Then when it does the
> > eval(x) part it dies. I tries to evaluate the word
> to
> > be an existing variable or something. Am I missing
> > something here.
> >
> > Thanks
> >
> > Eric
> >
> >
> > --- Khamid Nurdiev <khamid.nurdiev at gmail.com>
> wrote:
> >
> > > Thanks, it really works.
> > >
> > >
> > > On 8/13/07, bhaaluu <bhaaluu at gmail.com> wrote:
> > > >
> > > > Greetings,
> > > >
> > > > Disclaimer: I'm a Python Noob,
> > > > so use the code snippets
> > > > in this post, at your own risk!
> > > >
> > > > Is this what you're looking for?
> > > >
> > > > def dec(a):
> > > >     import string
> > > >     result=''
> > > >     for x in string.split(a):
> > > >         result=result+chr(eval(x))
> > > >     return result
> > > >
> > > > print dec(raw_input("Enter the message to
> decode:
> > > "))
> > > >
> > > > I took raw_input() out of the dec() function
> and
> > > pass the string to the
> > > > function
> > > > as an argument. Or, to assign it to a
> variable,
> > > then pass it:
> > > >
> > > > a=raw_input("Enter the message to decode: ")
> > > > print dec(a)
> > > >
> > > > Or, if you want to read the code from a file
> on
> > > disk called code.txt
> > > > which has the following code in it:
> > > > 65 66 67 68
> > > >
> > > > fin=open('code.txt','r)
> > > > a = fin.read()
> > > > fin.close()
> > > > print dec(a)
> > > >
> > > > ABCD
> > > > --
> > > > bhaaluu at gmail dot com
> > > >
> > > > On 8/12/07, Khamid Nurdiev
> > > <khamid.nurdiev at gmail.com> wrote:
> > > > > Hello All,
> > > > >  I am currently learning python with the
> book
> > > "Python programming: An
> > > > introduction to CS" by John M. Zelle and have
> come
> > > the section where he
> > > > speaks of encoding messages. Currently the
> basic
> > > snippet looks like this:
> > > > >
> > > > >
> > > > > >
> > > > > > > def dec():
> > > > > > >      import string
> > > > > > >     message=raw_input("Enter the message
> to
> > > decode: ")
> > > > > > >     result=''
> > > > > > >      for x in string.split(message):
> > > > > > >         result=result+chr(eval(x))
> > > > > > >      return result
> > > > > > >
> > > > > > >  print dec()
> > > > > >
> > > > >
> > > > >
> > > > > it works fine as expected but I want to
> enter
> > > the message as a variable
> > > > like:
> > > > > a='12 34 84 39 122'
> > > > > and when the function dec() invoked, i would
> > > just enter "a" as an input
> > > > and thus have changed the code a little bit
> but it
> > > is not working.
> > > > >
> > > > >
> > > > > >
> > > > > > >  def dec():
> > > > > > >     import string
> > > > > > >      message=raw_input("Enter the
> message to
> > > decode: ")
> > > > > > >     a=message[1:-1]
> > > > > > >     result=''
> > > > > > >      for x in string.split(a):
> > > > > > >         result=result+chr(eval(x))
> > > > > > >      return result
> > > > > > >
> > > > > > > print dec()
> > > > > > >
> > > > > >
> > > > >
> > > > > Have tried many ways, i don't want to write
> them
> > > all here as they will
> > > > take too much space. None of them work. maybe
> you
> > > guys know some way out? or
> > > > where is it going wrong?
> > > > >
> > > > >  Thanks
> > > > >
> > > > >
> _______________________________________________
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> > > > >
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> > > > >
> > > > >
> > > >
> > > >
> _______________________________________________
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> > > http://mail.python.org/mailman/listinfo/tutor
> > >
> >
> >
> >
> >      
>
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> 
Hello Eric!

Nice thanks.... I had the wrong input type..



       
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