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It was not obvious from the documentation on argparse how to emulate the optparse.OptionParser.allow_interspersed_args feature.
Please add something like the following to the section titled "Upgrading optparse code" (see: http://docs.python.org/library/argparse.html#upgrading-optparse-code )
"""
* If the optparse code sets allow_interspersed_args to False, then add an argparse positional argument with nargs=argparse.REMAINDER
"""

See also issue 14191, which describes the problems of trying to make argparse achieve the goal of the default optparse handling of allow_interspersed_args !
The documentation for that branch of the feature is also seriously incomplete, and the workaround is more than a single line.

ArgumentParser.parse_intermixed_arg() has been added in https://github.com/python/cpython/commit/0f6b9d230674da784ca79a0cf1a03d2af5a8b6a8 (Issue 14191) and the "Upgrading optparse code" section now has the following item:
* Replace optparse.OptionParser.disable_interspersed_args()
 by using ArgumentParser.parse_intermixed_args() instead of
 ArgumentParser.parse_args().
Closing this as 'outdated'.