paul j3 added the comment:
A possible problem with this patch is that it overrides any Namespace given by
the user. In the test example:
parser.parse_args(['X'], namespace=argparse.Namespace(foo=3))
the result is 'foo=2', the setdefault from the subparser. Previously, and with
a single level parser, the result would be 'foo=3'. This is also true for an
ordinary argument default in the subparser.
It could be argued that a user is unlikely to use both the 'namespace=...'
parameter, and 'setdefault' for the same variable, especially one that isn't an
argument 'dest'. But the fact that the custom namespace does not override
regular subparser argument defaults bothers me.
Also, should an untested change like this be applied to 3.4 and 2.7? This is
not a backward compatible bug fix.
The test case also touches on a real bug in the recent releases - subparsers
are now optional. 'parser.parse_args([])' runs without complaint about the
missing 'X'. Actually it is convenient for testing this case. But it is still
an incompatibility with earlier behavior
http://bugs.python.org/issue9253
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<http://bugs.python.org/issue9351>
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