Splitting a string into substrings of equal size

[Mark Tolonen]

"Gregor Lingl" <gregor.lingl at aon.at> wrote in message 
news:4a87036a$0$2292$91cee783 at newsreader02.highway.telekom.at...
> Emile van Sebille schrieb:
>> On 8/14/2009 5:22 PM candide said...
> ...
>>> What is the pythonic way to do this ?
>>
>> I like list comps...
>>
>>  >>> jj = '1234567890123456789'
>>  >>> ",".join([jj[ii:ii+3] for ii in range(0,len(jj),3)])
>> '123,456,789,012,345,678,9'
>>  >>>
>>
>> Emile
>>
>
> Less beautiful but more correct:
>
> >>> ",".join([jj[max(ii-3,0):ii] for ii in
>                              range(len(jj)%3,len(jj)+3,3)])
> '1,234,567,890,123,456,789'
>
> Gregor

Is it?

>>> jj = '234567890123456789'
>>> ",".join([jj[max(ii-3,0):ii] for ii in range(len(jj)%3,len(jj)+3,3)])
',234,567,890,123,456,789'

At least one other solution in this thread had the same problem.

-Mark