code: def _connection(self):
      '''
      Return a connection from the pool
      '''
      try:
        return self._pool.get(False)
      except Empty:
        args = [
          self._host, self._port, self._keyspace
        ]
        kwargs = {
          'user'              : None,
          'password'          : None,
          'cql_version'       : self._cql_version,
          'compression'       : self._compression,
          'consistency_level' : self._consistency_level,
          'transport'         : self._transport,
        }
        if self._credentials:
          kwargs['user'] = self._credentials['user']
          kwargs['password'] = self._credentials['password']
        return cql.connect(*args, **kwargsf _connection(self):
      '''
      Return a connection from the pool
      '''
      try:
        return self._pool.get(False)
      except Empty:
        args = [
          self._host, self._port, self._keyspace
        ]
        kwargs = {
          'user'              : None,
          'password'          : None,
          'cql_version'       : self._cql_version,
          'compression'       : self._compression,
          'consistency_level' : self._consistency_level,
          'transport'         : self._transport,
        }
        if self._credentials:
          kwargs['user'] = self._credentials['user']
          kwargs['password'] = self._credentials['password']
        return cql.connect(*args, **kwargs)
docs: Return a connection from the pool