Proposed argument changes to ntpq (fixing bug #319)

[Gary E. Miller]

Yo Ian!

On Thu, 8 Jun 2017 15:29:19 -0500
Ian Bruene via devel <devel at ntpsec.org> wrote:

> >> "A <colon> (':') shall be returned if getopt() detects a missing
> >> argument and the first character of optstring was a <colon> (':')."
> >>
> >> So optional optarg can be valid POXIX.  
> > I didn't know that.  Thanks.  
> 
> Unfortunately the documentation / StackOverflow questions / library
> code I've been able to find indicate that this feature does not exist
> in python's getopt.

NTPsec does not use Python's getopt().  It uses argparse().

https://docs.python.org/3/library/argparse.html

Of interest is Argumentparser.add_argument():

https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add_argument

Check out the second bullit under 16.4.3.3 nargs:

"'?'. One argument will be consumed from the command line if possible,
and produced as a single item. If no command-line argument is present,
the value from default will be produced. "

Then example code for what I suggested.

Simplied example code here:

>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--foo', nargs='?', const='c', default='d')
_StoreAction(option_strings=['--foo'], dest='foo', nargs='?', const='c', default='d', type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--foo', 'YY'])
Namespace(foo='YY')
>>> parser.parse_args(['--foo'])
Namespace(foo='c')



RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

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