def emit(self, eventDict):
        """
        Send a message event to the I{syslog}.

        @param eventDict: The event to send.  If it has no C{'message'} key, it
            will be ignored.  Otherwise, if it has C{'syslogPriority'} and/or
            C{'syslogFacility'} keys, these will be used as the syslog priority
            and facility.  If it has no C{'syslogPriority'} key but a true
            value for the C{'isError'} key, the B{LOG_ALERT} priority will be
            used; if it has a false value for C{'isError'}, B{LOG_INFO} will be
            used.  If the C{'message'} key is multiline, each line will be sent
            to the syslog separately.
        """
        # Figure out what the message-text is.
        text = log.textFromEventDict(eventDict)
        if text is None:
            return

        # Figure out what syslog parameters we might need to use.
        priority = syslog.LOG_INFO
        facility = 0
        if eventDict['isError']:
            priority = syslog.LOG_ALERT
        if 'syslogPriority' in eventDict:
            priority = int(eventDict['syslogPriority'])
        if 'syslogFacility' in eventDict:
            facility = int(eventDict['syslogFacility'])

        # Break the message up into lines and send them.
        lines = text.split('\n')
        while lines[-1:] == ['']:
            lines.pop()

        firstLine = True
        for line in lines:
            if firstLine:
                firstLine = False
            else:
                line = '\t' + line
            self.syslog(priority | facility,
                        '[%s] %s' % (eventDict['system'], line))

        Send a message event to the I{syslog}.

        @param eventDict: The event to send.  If it has no C{'message'} key, it
            will be ignored.  Otherwise, if it has C{'syslogPriority'} and/or
            C{'syslogFacility'} keys, these will be used as the syslog priority
            and facility.  If it has no C{'syslogPriority'} key but a true
            value for the C{'isError'} key, the B{LOG_ALERT} priority will be
            used; if it has a false value for C{'isError'}, B{LOG_INFO} will be
            used.  If the C{'message'} key is multiline, each line will be sent
            to the syslog separately.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/syslog.py