already written optparse callback for range and list arguments?

[Peter Hansen]

Alex Gittens wrote:
> I would like my program to accept a list of range values on the
> command line, like
> -a 1
> -a 1-10
> -a 4,5,2
> 
> In the interest of avoiding reinventing the wheel, is there already
> available code for a callback that would enable optparse to parse
> these as arguments?

Doesn't that depend on what you plan to do with them?  Do you want them 
as a special Range object, or a series of integers, or a list of tuples, 
or what?

-Peter