Splitting a string into substrings of equal size

[Emile van Sebille]

On 8/14/2009 5:22 PM candide said...
> Suppose you need to split a string into substrings of a given size (except
> possibly the last substring). I make the hypothesis the first slice is at the
> end of the string.
> A typical example is provided by formatting a decimal string with thousands
> separator.
> 
> 
> 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