paul j3 <ajipa...@gmail.com> added the comment:
I should study previous posts in more detail, but here are some thoughts on
correctly handling user namespace.
At the start of `parse_known_args`, there's a
if namespace is None:
namespace = Namespace()
We need to hang on to a copy of this namespace, e.g. call it
import copy
orig_namespace = copy.copy(namespace)
In _SubParsersAction.__call__, pass this copy to the subparser (instead of
None):
subnamespace, arg_strings = parser.parse_known_args(arg_strings,
orig_namespace)
for key, value in vars(subnamespace).items():
setattr(namespace, key, value)
Prior to 9351, the main namespace was passed to the subparser
namespace, arg_strings = parser.parse_known_args(arg_strings, namespace)
The trick is to get orig_namespace from the main parse_known_args to
SubParsersAction.__call__ method.
in a 9351 post I explore the idea of allowing the user to specify a
'sub_namespace' for the subparser.
https://bugs.python.org/msg230056
In any case, this is a complicated issue that needs careful thought and more
extensive testing. I didn't entirely like the original 9351 change, but since
that's been part of argparse for many years, we need to very careful about
clobbering it.
----------
status: pending -> open
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45235>
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