Sergey Konoplev <gray.ru@gmail.com> added the comment: Thank you for the hint. It is realy not so obvious. May be it is worth to add "--" into the usage string this way usage: [-h] [-b BAR [BAR ...]] -- foo Otherwise it leads to misunderstanding. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue9182> _______________________________________