Theodore Turocy <drarbi...@gmail.com> added the comment:

I was less than clear in what I wrote last night, Doug.  What I mean is that 
the idiom "::foo" for a long argument, instead of the more standard-looking 
"--foo", appears in the test suite.  This suggests to me that the intended 
behavior for the default help option should be to use a doubled prefix 
character in front of the long-form option.

For instance, if prefix_chars='+' and add_help=True, then the automatically 
provided help arguments will be '+h' and '++help'.

Certainly, if one explicitly adds an option '//myopt', we would not expect 
'::myopt' to also be accepted.  I'm talking here only about the options that 
argparse adds as a convenience.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9444>
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