Terence Honles <[email protected]> added the comment:
Thanks for the context Paul. I didn't think to look in the tracker for an
existing issue, sorry!
I'm not sure if documenting the requirement is sufficient or something that a
user would go towards with the error as it is.
I _might_ suggest throwing an error if dest/metavar isn't provided when
required is true but that would probably only work on creating the sub parser
and not if setting attributes as I saw some tests doing.
If an error is thrown I'd expect it to be where I placed the default name and
it to basically say sub parser has no name (and possibly suggest setting dest
or metavar).
I think both might be confusing to the end user and likely something that a
user relying on argparse might not test but expect to work (I am in that camp
except I tested it... I was only wondering what it said). That is why I went
with filling out the default of "command" (I also checked only one sub parser
was allowed so that wouldn't be too ambiguous). Initially I went with
"subcommand" because "subparser" didn't seem to make sense for an end user, but
I settled with command since that's what some tests were using for dest and I
liked it. I had also thought of expanding to all the options as one of the
comments had in the other issue, but required argument: {command1,command2,...}
looked a little funny and was less obvious what it meant since it could also
looked like N arguments were missing and being represented in a collapsed
representation.
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<https://bugs.python.org/issue43874>
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