Terry J. Reedy added the comment:
If you can somewhat solve the problem by better using the existing api, good. I
am not 'stuck' on reusing str/repr*. If metavar is non-optional for
non-iterable choices, the doc should say so in the entry for choices. (Does the
test suite already have a testcase already for non-iterable choices + metavar?)
If you can solve it even better and remove that limitation by extending the
'default_metaver' idea from positional and optional args to choices ('choiced'
args), even better.
I think the refactoring may still be needed, especially for #16418, but that is
that issue.
* My main concern is that the attempt to provide helpful info to end users not
hang or kill a program. IDLE used to sometimes quit while attempting to provide
a nice calltip (#12510). It currently quits on Windows when attempting to warn
users about bad custom configuration (#14576).
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16468>
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