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Re: argparse - specify order of argument parsing?

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On 8/31/2013 1:11 PM, Eduardo Alvarez wrote:
> When using argparse, is there a way to specify in what order arguments
> get parsed?

I expect argparse to forward iterate the sequence of arguments that it 
receives.

> I am writing a script whose parameters can be modified in
> the following order:
>
> Defaults -> config file -> command-line switches.
>
> However, I want to give the option of specifying a config file using a
> command line switch as well, so logically, that file should be parsed
> before any other arguments are applied. However, it seems that
> parse_args() parses arguments in the order they're given,

Right.

 > so if the
> config file switch is not given first, the config file will overwrite
> whatever was in the command-line switches, which should have higher
> priority.

So just document that a config file has to be given first to work as 
expected. Order dependence among arguments is common.

-- 
Terry Jan Reedy

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Thread

argparse - specify order of argument parsing? Eduardo Alvarez <!nospam!astrochelonian@gmail.com> - 2013-08-31 13:11 -0400
  Re: argparse - specify order of argument parsing? Tim Chase <python.list@tim.thechases.com> - 2013-08-31 12:50 -0500
  Re: argparse - specify order of argument parsing? Terry Reedy <tjreedy@udel.edu> - 2013-08-31 14:13 -0400
  Re: argparse - specify order of argument parsing? Terry Reedy <tjreedy@udel.edu> - 2013-08-31 14:17 -0400
  Re: argparse - specify order of argument parsing? Peter Otten <__peter__@web.de> - 2013-09-01 08:53 +0200

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