Reimplement PythonShellWidget method

def setup_context_menu(self):
        """Reimplement PythonShellWidget method"""
        PythonShellWidget.setup_context_menu(self)
        self.help_action = create_action(self, _("Help..."),
                           icon=ima.icon('DialogHelpButton'),
                           triggered=self.help)
        self.menu.addAction(self.help_action)