Xiang Zhang added the comment:

I agree with Berker. Even without any exceptions, the help message given is not 
what add_argument_group and add_mutually_exclusive_group intend.

You can see

usage: argparse_test.py [-h] [--foo] -u URL -p PROJECT [--dump] --mergeInput
                        MERGEINPUT [--removeDisabled] -c CHECKERS

Sets the checkers of a klocwork project

optional arguments:
  -h, --help            show this help message and exit
  --foo
  -c CHECKERS, --checkers CHECKERS
                        File which lists the checkers to be enabled.

There is not group name and still optional arguments. And the command line does 
not show exclusive. I believe they are not designed to work like this.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26952>
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