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Re: Why does argparse return None instead of [] if an append action isn't used?

References <l265obxc6d.ln2@news.ducksburg.com>
Date 2015-01-09 08:57 -0600
Subject Re: Why does argparse return None instead of [] if an append action isn't used?
From Skip Montanaro <skip.montanaro@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.17527.1420815432.18130.python-list@python.org> (permalink)

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> I noticed in use that if an option with the 'append' action isn't
> used, argparse assigns None to it rather than an empty list, &
> confirmed this interactively:

I don't use argparse (or optparse), being a getopt Luddite myself, but
can you set the default for an action in the add_argument call?

Skip

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Why does argparse return None instead of [] if an append action isn't used? Adam Funk <a24061@ducksburg.com> - 2015-01-09 14:44 +0000
  Re: Why does argparse return None instead of [] if an append action isn't used? Skip Montanaro <skip.montanaro@gmail.com> - 2015-01-09 08:57 -0600
    Re: Why does argparse return None instead of [] if an append action isn't used? Adam Funk <a24061@ducksburg.com> - 2015-01-09 15:25 +0000
  Re: Why does argparse return None instead of [] if an append action isn't used? Ned Batchelder <ned@nedbatchelder.com> - 2015-01-09 10:12 -0500
    Re: Why does argparse return None instead of [] if an append action isn't used? Adam Funk <a24061@ducksburg.com> - 2015-01-26 13:43 +0000
      Re: Why does argparse return None instead of [] if an append action isn't used? Peter Otten <__peter__@web.de> - 2015-01-26 15:04 +0100
        Re: Why does argparse return None instead of [] if an append action isn't used? Adam Funk <a24061@ducksburg.com> - 2015-01-26 15:50 +0000
          Re: Why does argparse return None instead of [] if an append action isn't used? Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-26 09:13 -0700
            Re: Why does argparse return None instead of [] if an append action isn't used? Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-26 18:29 +0200
              Re: Why does argparse return None instead of [] if an append action isn't used? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-26 17:18 +0000
              Re: Why does argparse return None instead of [] if an append action isn't used? Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-26 11:23 -0700
              Re: Why does argparse return None instead of [] if an append action isn't used? Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-26 11:26 -0700
  Re: Why does argparse return None instead of [] if an append action isn't used? Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2015-01-09 16:50 +0100
    Re: Why does argparse return None instead of [] if an append action isn't used? Adam Funk <a24061@ducksburg.com> - 2015-01-26 13:43 +0000

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