[issue28210] argparse with subcommands difference in python 2.7 / 3.5

[Tim Graham]

Tim Graham added the comment:

Based on the usage output, it looks like the subcommand is required, but I'm not sure if there are cases where a subcommand could be optional. David, can you advise?

usage: test_argparse.py [-h] command ...

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nosy: +r.david.murray

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<http://bugs.python.org/issue28210>
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