Re: argparse - option with optional value

[Miki Tebeka]

> There is a built-in “no value specified” value in Python: the None
> singleton. The ‘argparse’ library uses this for the argument default
> already, so you don't need to fuss with your own special handling
> <URL:http://docs.python.org/library/argparse.html#default>.
The problem with this approach is that in both cases of not specifying -e and 
with -e with no argument the value of args.edit is None.
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