Re: [Tutor] How to convert hex representation of char? (Challenge part 8)

2005-05-19 Thread Pieter Lust 
Alan G wrote:
  '\x14' is the actual non printable charactewrs. If it were printable
  you
  would see its printed representation, because it isn't Pyhon showsw
  you
  the hex code as an escaped character but it is the character.
 

Thanks for the input. I'm sorry, my question was not clear enough.

The problem is that (to stick with the example) '\x14' is not the 
character 0x14, but a string of length 4. It consists of the characters 
backslash, 'x', '1' and '4'. (I verified the output of len()).
What I want to do is make Python believe that that string of length 4 is 
actually a string of length 1 that contains character 0x14. Any help on 
how to achieve that is appreciated.


Pieter Lust

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Re: [Tutor] How to convert hex representation of char? (Challenge part 8)

2005-05-19 Thread Kent Johnson 
Pieter Lust wrote:
 Alan G wrote:
   '\x14' is the actual non printable charactewrs. If it were printable
   you
   would see its printed representation, because it isn't Pyhon showsw
   you
   the hex code as an escaped character but it is the character.
  
 
 Thanks for the input. I'm sorry, my question was not clear enough.
 
 The problem is that (to stick with the example) '\x14' is not the 
 character 0x14, but a string of length 4. It consists of the characters 
 backslash, 'x', '1' and '4'. (I verified the output of len()).
 What I want to do is make Python believe that that string of length 4 is 
 actually a string of length 1 that contains character 0x14. Any help on 
 how to achieve that is appreciated.

One way is to paste the string into a program; when Python sees '\x14' it 
creates a string of length 1:

   len('\x14')
1

Alternately you can use the 'string_escape' codec to convert the string:
   s=r'\x14'
   len(s)
4
   t=s.decode('string_escape')
   t
'\x14'
   len(t)
1

Kent

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Re: [Tutor] How to convert hex representation of char? (Challenge part 8)

2005-05-19 Thread plust 
Kent Johnson wrote:
snip
 One way is to paste the string into a program; when Python sees '\x14' it 
 creates a string of length 1:
 
len('\x14')
 1
 
 Alternately you can use the 'string_escape' codec to convert the string:
s=r'\x14'
len(s)
 4
t=s.decode('string_escape')
t
 '\x14'
len(t)
 1
 
 Kent
 

Thanks! That solves my problem.

Pieter Lust.

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Re: [Tutor] How to convert hex representation of char? (Challenge part 8)

2005-05-18 Thread Alan G 
 onepart and anotherpart contain many hex representations of
nonprintable
 characters, like '\x14'. But I can't manage to convert those to the
 actual nonprintable characters. Any hints on how to do this?

'\x14' is the actual non printable charactewrs. If it were printable
you
would see its printed representation, because it isn't Pyhon showsw
you
the hex code as an escaped character but it is the character.

You can get the numeric value using ord just as you would any other
character:

 print ord('\x14')
20
 print ord{'Q'}
81


so '\x14' is the character, it should just work...

Alan G
Author of the Learn to Program web tutor
http://www.freenetpages.co.uk/hp/alan.gauldHTH,


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