Well here is a script I found somewhere on the web I use most time .
but there are many,you can also edit the tags with easytag ,ex Falso or Kid3
RTFM

here is a snippet of the record.py ,I took out  from Airtime library(libs)and made mine

 def set_metadata_and_save(self, filepath):
        """
        Writes song to 'filepath'. Uses metadata from:
            self.start_time, self.show_name, self.show_instance
        """
        try:
            full_date, full_time = self.start_time.split(" ",1)
            # No idea why we translated - to : before
            #full_time = full_time.replace(":","-")
            self.logger.info("time: %s" % full_time)
            artist = "Airtime Show Recorder"
            #set some metadata for our file daemon
            recorded_file           = mutagen.File(filepath, easy = True)
            recorded_file['artist'] = artist
            recorded_file['date']   = full_date
            recorded_file['title'] = "%s-%s-%s" % (self.show_name,
                    full_date, full_time)
            #You cannot pass ints into the metadata of a file. Even tracknumber needs to be a string
            recorded_file['tracknumber'] = unicode(self.show_instance)
            recorded_file.save()

        except Exception, e:
            top = traceback.format_exc()
            self.logger.error('Exception: %s', e)
            self.logger.error("traceback: %s", top)