code: def delete(self):
          
  
          if not HAS_SQL:  # pragma: nocover
              return
          try:
              conn, c = self.connect()
              c.execute('DELETE FROM {0}'.format(self.table_name))
              conn.commit()
              conn.close()
          except:
              log.traceback(logging.DEBUG)
docs: Clears all cached Session objects.