paul j3 added the comment:
None of the `append` actions makes sense with positionals. The name (and hence
the 'dest') must be unique. And positionals can't be repeated.
There are other ways to put a pair of values in the Namespace. For example,
after parsing
args.x = [42, 43]
or before
ns = argparse.Namespace(x=[42,43])
parser.parse_args(namespace=ns)
or the `const` (or better the default) could be `[42, 43]`.
Plain `append` might let you put `[42,43]` in the dest via the default, and
then append further values to that list (from the user). I'd have to test that.
It might be instructive to look at the `test_argparse.py` file, and search for
test cases that use `append` or `const`.
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<http://bugs.python.org/issue24419>
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