Rémi Rampin added the comment:

To me this is much more than a compatibility problem. The way it worked before 
made a lot of sense, and just felt like the "correct" solution to accept a flag 
in multiple places.

Having a --verbose flag is something everybody should consider (Python has a 
decent builtin logging module), and anybody providing it would definitely want 
to accept it before and after subcommands (or at least, for every subcommand).

The only way right now is to not only create different arguments with 
add_argument(), for each parser, but you also need to provide different 
destination names (and then do something shitty like verbosity = 
args.verb_main+args.verb_subcommand). This bug makes argparse completely 
unusable for any real-life application that uses subparsers (in addition to 
breaking existing programs). And it breaks silently too, simply amazing!

Of course there is very little point in fixing this now. Since this affects 
multiple released versions of Python, I have to use a work-around anyway (until 
I can move from argparse to something that won't decide to break someday for 
the hell of it).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9351>
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