Checking a Number for Palindromic Behavior

alex23 wuwei23 at gmail.com
Mon Oct 19 05:45:47 CEST 2009


On Oct 19, 12:32 pm, ru... at yahoo.com wrote:
> On Oct 18, 4:20 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>
> > Benjamin Middaugh wrote:
> > > Thanks to everyone who helped with my query on reversing integers. I
> > > have one more simple problem I'm having trouble solving. I want to check
> > > a number for palindromic behavior (reading the same backwards and
> > > forwards). So if I have an integer 1457 it can tell me this is not the
> > > same from both ends but 1551 is. I think the simplest way would be to
> > > work inwards from both ends checking digits for equality, but I don't
> > > know enough (yet) to do this.
>
> > > All help is much appreciated.
>
> > It's a palindrome if it's the same as its reverse. You already know how
> > to reverse it, and you should already know how to check whether two
> > things are the same, so... :-)
>
> Something like:
>
> def is_palidrome (n):
>     return str(n) == ''.join (reversed (str(n)))
>
> which will return True if integer n is a palidromic or False
> otherwise.

_Not_ providing the code was MRAB's entire point here. It's nice to
show that you're clever and all, but that doesn't really help the OP
learn.



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