code: def delete_many(self, keys, noreply=None):
          
          if not keys:
              return True
  
          if noreply is None:
              noreply = self.default_noreply
  
          cmds = []
          for key in keys:
              cmds.append(
                  b'delete ' + self.check_key(key) +
                  (b' noreply' if noreply else b'') +
                  b'\r\n')
          self._misc_cmd(cmds, b'delete', noreply)
          return True
docs: A convenience function to delete multiple keys.
  
          Args:
            keys: list(str), the list of keys to delete.
            noreply: optional bool, True to not wait for the reply (defaults to
                     self.default_noreply).
  
          Returns:
            True. If an exception is raised then all, some or none of the keys
            may have been deleted. Otherwise all the keys have been sent to
            memcache for deletion and if noreply is False, they have been
            acknowledged by memcache.