New submission from paul j3:
"16.4.3.11. dest
For optional argument actions,... Any internal - characters will be converted
to _ characters to make sure the string is a valid attribute name."
In _get_optional_kwargs(), dest = dest.replace('-', '_'); but there is nothing
like this in _get_positional_kwargs()
Thus if
parser.add_argument('foo-bar',...)
this attribute can only be accessed with
getattr(namespace, 'foo-bar').
Alternatives:
- ignore this since no one has complained about it
- stress in the documentation that the positionals name should be a valid
python attribute name
- test the name during add_argument
- add the dest.replace('-','_') to positionals
But as things stand, even an optional can be given a weird dest -
a=p.add_argument('--foo*[]-bar')
requiring
getattr(args,'foo*[]_bar')
I assume that optionals have this dash replacement because historically some
unix (or other) programs have accepted options like '--foo-bar' (though off
hand I can't think of any).
----------
components: Library (Lib)
messages: 189090
nosy: paul.j3
priority: normal
severity: normal
status: open
title: argparse does not dest.replace('-', '_') for postionals
type: behavior
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue17965>
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