>>> result = client.get_slice(keyspace, key, column_parent, predicate, ConsistencyLevel.ONE);
/usr/lib64/python2.6/site-packages/thrift/Thrift.py:58: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6
  self.message = message
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/mark/work/common/cassandra/Cassandra.py", line 196, in get_slice
    self.send_get_slice(keyspace, key, column_parent, predicate, consistency_level)
  File "/home/mark/work/common/cassandra/Cassandra.py", line 209, in send_get_slice
    self._oprot.trans.flush()
  File "/usr/lib64/python2.6/site-packages/thrift/transport/TTransport.py", line 165, in flush
    self.__trans.write(out)
  File "/usr/lib64/python2.6/site-packages/thrift/transport/TSocket.py", line 99, in write
    raise TTransportException(type=TTransportException.NOT_OPEN, message='Transport not open')
thrift.transport.TTransport.TTransportException: Transport not open