describes various contents of data table

def describe_contents(self):
        """ describes various contents of data table """
        print('======================================================================')
        print(self)
        print('Table  = ',  str(len(self.header)) + ' cols x ' + str(len(self.arr)) + ' rows')
        print('HEADER = ', self.get_header())
        print('arr    = ', self.arr[0:2])