def handle_opt(self,option,value = None):
        """Set an option, overwriting the existing value.
        """
        try:
            if value is None:
                return self.runner.ui.say(vdebug.opts.Options.get_for_print(option))
            else:
                self.runner.ui.say("Setting vdebug option '%s' to: %s"\
                                    %(option,value))
                vim.command('let g:vdebug_options["%s"] = "%s"' +(option,value))
                return vdebug.opts.Options.overwrite(option,value)

        except Exception, e:
            self.handle_exception(e)
dataset/ETHPy150Open joonty/vdebug/plugin/python/start_vdebug.py/DebuggerInterface.handle_opt/operator `%` -> `+`