Clear the internal (private) variables of the class.

def clear(self):
        """
        Clear the internal (private) variables of the class.
        """
        self.filename = ''
        self.filehandler = 0
        # Station name, identification and revision year:
        self.station_name = ''
        self.rec_dev_id = ''
        self.rev_year = 0000
        # Number and type of channels:
        self.TT = 0
        self.A = 0 # Number of analog channels.
        self.D = 0 # Number of digital channels.
        # Analog channel information:
        self.An = []
        self.Ach_id = []
        self.Aph = []
        self.Accbm = []
        self.uu = []
        self.a = []
        self.b = []
        self.skew = []
        self.min = []
        self.max = []
        self.primary = []
        self.secondary = []
        self.PS = []
        # Digital channel information:
        self.Dn = []
        self.Dch_id = []
        self.Dph = []
        self.Dccbm = []
        self.y = []
        # Line frequency:
        self.lf = 0
        # Sampling rate information:
        self.nrates = 0
        self.samp = []
        self.endsamp = []
        # Date/time stamps:
        #    defined by: [dd,mm,yyyy,hh,mm,ss.ssssss]
        self.start = [00,00,0000,00,00,0.0]
        self.trigger = [00,00,0000,00,00,0.0]
        # Data file type:
        self.ft = ''
        # Time stamp multiplication factor:
        self.timemult = 0.0
        
        self.DatFileContent = ''