--optimizer Adam,learning_rate=0.01,something_else=3 That syntax isn’t so bad! =]
How would you suggest the help text for this looks? (don’t worry about implementation, just what goes to stdout/stderr) PS: Yeah I used square brackets for my Bash arrays On Fri, 16 Oct 2020 at 10:26 am, Cameron Simpson <c...@cskk.id.au> wrote: > One other thing: > > On 15Oct2020 20:53, Samuel Marks <samuelma...@gmail.com> wrote: > >Idea: preprocess `sys.argv` so that this syntax would work > >`--optimizer Adam[learning_rate=0.01]`* > > > >*square rather than round so as not to require escape characters or > >quoting in `sh` > > Square brackets are also shell syntax, introducing glob character > ranges. You're only not noticing probably because an unmatched glob is > normally let through unchanged. > > For example: > > somecmd x[b] > > would go through as "x[b]" _unless_ you had a matching local filename > (in this case a file named "xb") in which case the shell would match the > glob and pass through the match (in this case "xb"). > > You'll find this issue a fair bit: if you want some punctuation, someone > else has probably already wanted that punctuation for something. You'll > still need to quote things for a lot of stuff. > > Commas are not special. You could try: > > --optimizer Adam,learning_rate=0.01,something_else=3 > > which would work for a fair amount of stuff. > > >Unfortunately this approach wouldn't give nice `--help` text. > >What's the right solution here? > > To get nice help text you need your command line parser to be able to > compose that help text in some way. Usually the help text in argparse is > supplied when you define the option. > > Cheers, > Cameron Simpson <c...@cskk.id.au> > -- Samuel Marks Charity <https://sydneyscientific.org> | consultancy <https://offscale.io> | open-source <https://github.com/offscale> | LinkedIn < https://linkedin.com/in/samuelmarks> -- https://mail.python.org/mailman/listinfo/python-list
