def add_subcommands(parser, namespace, functions, **namespace_kwargs):
add_commands(parser, functions, namespace=namespace,<EOL>namespace_kwargs=namespace_kwargs)<EOL>
A wrapper for :func:`add_commands`.

These examples are equivalent::

    add_commands(parser, [get, put], namespace='db',
                 namespace_kwargs={
                     'title': 'database commands',
                     'help': 'CRUD for our silly database'
                 })

    add_subcommands(parser, 'db', [get, put],
                    title='database commands',
                    help='CRUD for our silly database')