[Tutor] Need help with Factorial algorithm using Python

Terry Carroll carroll at tjc.com
Fri Sep 5 07:24:55 CEST 2008

On Thu, 4 Sep 2008, Robert Berman wrote:

> Time to do some reading about regex. And here I thought I was slick
> working with lists and strings.

You shouldn't need a regexp for this.  An easy way to count the trailing
zeros is:

 - convert the number to a string;
 - make a copy, stripping off the trailing zeroes, using rstrip('0')
 - compare the lengths of the two strings

The difference in the lengths is the number of trailing zeroes.

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