def debug(self, group, message):
        '''Maybe write a debug-level log message.

        In particular, this gets written if the hidden `debug_worker`
        option contains `group`.

        '''
        if group in self.debug_worker:
            if 'stdout' in self.debug_worker:
                print message
            self.log(logging.DEBUG, message)
Maybe write a debug-level log message.

        In particular, this gets written if the hidden `debug_worker`
        option contains `group`.