[Tutor] detecing palindromic strings

[bhaaluu]

Greetings,

Try something with this:

>>> string = 'abc'
>>> string
'abc'
>>> for i in range(len(string)-1,-1,-1):
...     print string[i],
...
c b a

-- 
b h a a l u u at g m a i l dot c o m
http://www.geocities.com/ek.bhaaluu/index.html

On 9/28/07, Christopher Spears <cspears2002 at yahoo.com> wrote:
> I'm trying to write a script that detects if a string
> is palindromic (same backward as it is forward).  This
> is what I have so far:
>
> #!/usr/bin/env python
>
> my_str = raw_input("Enter a string: ")
>
> string_list = []
>
> for s in my_str:
>     string_list.append(s)
>
> string_list_orig = string_list
>
> string_list.reverse()
>
> print string_list_orig
> print string_list
>
> The problem is that the script gives results like so:
> io at io-station-1 ./chap6 117> python palindromic.py
> Enter a string: abc
> ['c', 'b', 'a']
> ['c', 'b', 'a']
>
> Now I understand pointers and Python!  :-)  Since
> string_list_orig is pointing to string_list, when I
> reversed string_list, string_list_orig was reversed as
> well.
>
> How do I get around this?  Is there a better way to
> write this script?  I can't figure out how to loop
> through a string starting from the last character.
>
>
> "I'm the last person to pretend that I'm a radio.  I'd rather go out and be a color television set."
> -David Bowie
>
> "Who dares wins"
> -British military motto
>
> "I generally know what I'm doing."
> -Buster Keaton
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