On Fri, Oct 9, 2009 at 8:51 AM, Jonathan Ballet
<jonathan.bal...@securactive.net> wrote:
> If I want this option to have an optional value, I think I must set a
> default value to the option. But then, how to make the distinction
> between the two first cases? I might miss something I don't know in
> option parsing, but I didn't find anything...

I'd try the same approach as default options in Python functions.  Make
the default None (which isn't a valid seed) and then you can tell the
Benji York
Senior Software Engineer
Zope Corporation
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