paul j3 added the comment:
The 'subparsers' object has a _parser_class attribute that is normally set to
the class of the parent parser. In the attached file I create a
class CustomParser(argparse.ArgumentParser)
that makes a parser instance which copies all of the attributes of prototype
parser.
proto1 = argparse.ArgumentParser(prog='SUBPROG1')
proto1.add_argument('--foo')
subparsers._parser_class = CustomParser
sub1 = subparsers.add_parser('cmd1', proto=proto1, help='parser based on
proto1')
'sub1' is a functional copy of 'proto1'. I think this does what you want
without changing the argparse code. There probably is a way of defining
CustomParser (maybe its '__new__' method) so 'sub1' is actually 'proto1'. But
the copy approach appears to work just fine.
----------
nosy: +paul.j3
Added file: http://bugs.python.org/file29916/issue17204.py
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