Hello,
On Fri, Jan 27, 2023 at 4:22 PM Weatherby,Gerard <gweathe...@uchc.edu> wrote:
>
> Why not something like:
>
>
> parser.add_argument("-z", "--zone")
>
> args = parser.parse_args()
> if args.zone and args.zone not in ptyz.all_timezones:
>
> print(“Invalid timezone”,file=sys.stderr)
>
This is what I use now. I still wonder if I can mold HelpFormatter to
do what I want it to do.
> …
>
>
>
>
> From: Python-list <python-list-bounces+gweatherby=uchc....@python.org> on
> behalf of Ivan "Rambius" Ivanov <rambiusparkisan...@gmail.com>
> Date: Friday, January 27, 2023 at 3:33 PM
> To: Python <python-list@python.org>
> Subject: Custom help format for a choice argparse argument
>
> *** Attention: This is an external email. Use caution responding, opening
> attachments or clicking on links. ***
>
> Hello,
>
> I am developing a script that accepts a time zone as an option. The
> time zone can be any from pytz.all_timezones. I have
>
> def main():
> parser = argparse.ArgumentParser()
> parser.add_argument("-z", "--zone", choices=pytz.all_timezones)
> args = parser.parse_args()
> print(args)
> print(f"Specified timezone: {args.zone}")
>
> It works, but when I run it with the -h option it dumps all entries in
> pytz.all_timezones. I would like to modify the help format for just
> -z|--zone option. I read the docs about HelpFormatter and argparse.py
> and I ended up with
>
> class CustomHelpFormatter(argparse.HelpFormatter):
> def _metavar_formatter(self, action, default_metavar):
> if action.dest == 'zone':
> result = 'zone from pytz.all_timezones'
> def format(tuple_size):
> if isinstance(result, tuple):
> return result
> else:
> return (result, ) * tuple_size
> return format
> else:
> return super(CustomHelpFormatter,
> self)._metavar_formatter(action, default_metavar)
>
>
> def main():
> parser = argparse.ArgumentParser(formatter_class=CustomHelpFormatter)
> parser.add_argument("-z", "--zone", choices=pytz.all_timezones)
> args = parser.parse_args()
> print(args)
> print(f"Specified timezone: {args.zone}")
>
> This works, but is there a more elegant way to achieve it?
>
> Regards
> rambius
>
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