[Tutor] Re: reverse a number (was no subject)

[Lance E Sloan]

--On Thursday, August 22, 2002 9:21 AM -0700 Sean 'Shaleh' Perry 
<shalehperry@attbi.com> wrote:
>> How about converting the number to a list and then reversing the elements
>> now:
>>
>> 	m=list(str(int(number)))
>> 	m.reverse()
>> 	numString=''.join(m) #this is your reversed number as a string
>>
>
> or the old school C way (-:
>
>>>> l = []
>>>> n = 321
>>>> while n:
> ...   l.append(n % 10)
> ...   n /= 10
> ...
>>>> l
> [1, 2, 3]

Sure.  And while we're in that neighborhood, we might as well be even more 
C-like and leave out the list:

>>> n = 321
>>> m = 0
>>> while n:
...   m = m * 10 + n % 10
...   n /= 10
...
>>> m
123

--
Lance E Sloan
Web Services, Univ. of Michigan: Full-service Web and database design,
development, and hosting.  Specializing in Python & Perl CGIs.
http://websvcs.itd.umich.edu/ - "Putting U on the Web"