def usage(self, msg):
        self.stderr.write("Error: %s\n" % str(msg))
        self.stderr.write("For help, use %s -h\n" % self.progname)
        self.exit(2)
Print a brief error message to stderr and exit(2).
dataset/ETHPy150Open XiaoMi/minos/supervisor/supervisor/options.py/Options.usage