New submission from Barry A. Warsaw:
Sometimes we want to control the order of arguments printed by an argparse
defined cli. In practice, arguments are printed in the order in which they are
added via add_argument(), but I don't think this is documented and thus should
be considered an implementation detail. It should be possible to enforce an
order by the use of a formatter_class, but you'd probably need some extra
metadata on arguments to do this, so it's not completely obvious how to write
such a formatter class.
Instead, I propose to document and officially support that the order of
add_argument() calls defines the order in which arguments are printed via
nosy: barry, docs@python
title: Is order of argparse --help output officially defined?
versions: Python 3.5, Python 3.6, Python 3.7
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