http://bugs.python.org/issue14191
'argparse doesn't allow optionals within positionals'

implements a 'parse_intermixed_args()' method, which parses all of the optionals with one pass, followed by a second pass that handles the positionals.  It does this by temporarily deactivating the positionals for the first pass.  It emulates the optparse behavior (with the added ability to parse positionals).

This is too big of a change to ever become the default behavior for argparse.