docs: def delete(self, primary_key):
          
          ''' 
              a method to delete a record in the table
           
          :param primary_key: string with primary key of record 
          :return: string with status message
          '''
          
          title = '%s.delete' % self.__class__.__name__
      
      # delete object
          delete_statement = self.table.delete(self.table.c.id==primary_key)
          self.session.execute(delete_statement)
      
      # return message
          exit_msg = '%s has been deleted.' % primary_key
          return exit_msg