iterating in reverse

Jonathan P. jbperez808 at yahoo.com
Tue Jan 21 02:07:34 CET 2003


Chad Netzer <cnetzer at mail.arc.nasa.gov> wrote in message news:<mailman.1042798054.23362.python-list at python.org>...
> ~~~~~~~~~~~~~
> seq = "the quick brown fox jumped over the lazy dog"
> for i in xrange( len( seq ) ):
>    forward_iter = seq[i]
>    backward_iter = seq[-(i + 1)]
>    pass # do whatever you need
> ~~~~~~~~~~~~~
> 
> In this case, you don't copy or generate any new lists at all, so it 
> should be quite quick.

Chad, I think this is the best solution so far.
Clean and fast and _obvious_.  So much so that I'd 
like to kick myself for not coming up with that 
sooner. Sigh...




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