How to use the pylsl.pylsl function in pylsl

def refreshStreams(self):
        """ Refresh the stream list. """
        # get all streams on the lab network
        self.ResolvedStreams = list(pylsl.resolve_streams(1.0))
        # sort them by UID to get a reproducible order
        self.ResolvedStreams.sort(key=lambda x: x.uid())
        # get their names
        self.ResolvedNames = [];
        for k in range(len(self.ResolvedStreams)):
            self.ResolvedNames.append(self.ResolvedStreams[k].name() + ' (' + self.ResolvedStreams[k].hostname() +')')
        # find those that are required but missing
        missing = [n for n in self.RequiredStreams if (n not in self.ResolvedNames)]
        self.MissingStreams = missing
        allnames = []
        allnames += self.ResolvedNames
        allnames += missing
        # update the listbox contents
        good_brush = QBrush()
        good_brush.setColor(QColor(0,128,0))
        bad_brush = QBrush()

def init_markers(lsl,logfile,datariver,serialport,uid):
    """ Initialize the marker protocols to use. """

    if lsl:
        try:
            global lsl_backend
            import pylsl.pylsl as pylsl
            info = pylsl.stream_info("SNAP-Markers","Markers",1,0,pylsl.cf_string,"SNAPmarkers-" + uid)
            lsl_backend = pylsl.stream_outlet(info)
            lsl_backend.pylsl = pylsl
            print "The lab streaming layer is ready for sending markers."
        except:
            print "Error initializing the lab streaming layer backend. You will not be able to send and record event markers via LSL."
            
    if logfile:
        try:
            # find a new slot for the logfiles
            for k in xrange(10000):
                fname = 'logs/markerlog-' + str(k) + '.log'
                if not os.path.exists(fname):
                    global marker_log
                    marker_log = open(fname,'w')
                    break
            print "A marker logfile has been prepared for logging."
        except:

def init_markers(lsl,logfile,datariver,serialport,uid):
    """ Initialize the marker protocols to use. """

    if lsl:
        try:
            global lsl_backend
            import pylsl.pylsl as pylsl
            info = pylsl.stream_info("SNAP-Markers","Markers",1,0,pylsl.cf_string,"SNAPmarkers-" + uid)
            lsl_backend = pylsl.stream_outlet(info)
            lsl_backend.pylsl = pylsl
            print "The lab streaming layer is ready for sending markers."
        except:
            print "Error initializing the lab streaming layer backend. You will not be able to send and record event markers via LSL."
            
    if logfile:
        try:
            # find a new slot for the logfiles
            for k in xrange(10000):
                fname = 'logs/markerlog-' + str(k) + '.log'
                if not os.path.exists(fname):
                    global marker_log
                    marker_log = open(fname,'w')
                    break
            print "A marker logfile has been prepared for logging."

def init_markers(lsl,logfile,datariver,serialport,uid):
    """ Initialize the marker protocols to use. """

    if lsl:
        try:
            global lsl_backend
            import pylsl.pylsl as pylsl
            info = pylsl.stream_info("SNAP-Markers","Markers",1,0,pylsl.cf_string,"SNAPmarkers-" + uid)
            lsl_backend = pylsl.stream_outlet(info)
            lsl_backend.pylsl = pylsl
            print "The lab streaming layer is ready for sending markers."
        except:
            print "Error initializing the lab streaming layer backend. You will not be able to send and record event markers via LSL."
            
    if logfile:
        try:
            # find a new slot for the logfiles
            for k in xrange(10000):
                fname = 'logs/markerlog-' + str(k) + '.log'
                if not os.path.exists(fname):
                    global marker_log
                    marker_log = open(fname,'w')
                    break
            print "A marker logfile has been prepared for logging."
        except:
            print "Error initializing the marker logging. Your event markers will not be logged into a file."

raise ValueError("Please specify a stream name or a property and value.")
        if offset_correction:
            self.logger.warning(
                'The "offset_correction" parameter is deprecated. Use "sync" instead.'
            )
            sync = "local"
        self._prop = prop
        self._value = value
        self._inlet = None
        self._labels = None
        self._unit = unit
        self._sync = sync
        self._channels = channels
        self._timeout = timeout
        self._max_samples = max_samples
        self._offset = time() - pylsl.local_clock()