telmich added the comment:
Thanks a lot - let me know when I can help more.
After re-reading the documentation, I think the behaviour for subparsers is not
specified: It is not specified, whether a subparser is required to be present
or not.
Attached stripped down version of the cdist code to a bare minimum
(subparse.py) which shows the problem more clear:
% python3 -V
Python 3.2.3
% python3 ~/subparse.py
usage: subparse.py [-h] [-V] {banner} ...
subparse.py: error: too few arguments
versus
[15:44] brief:~% python3 -V
Python 3.3.0
[15:46] brief:~% python3 subparse.py
Traceback (most recent call last):
File "subparse.py", line 31, in <module>
commandline()
File "subparse.py", line 25, in commandline
args.func(args)
AttributeError: 'Namespace' object has no attribute 'func'
----------
Added file: http://bugs.python.org/file27694/subparse.py
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<http://bugs.python.org/issue16308>
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