Thrift python 3.4 TypeError: string argument expected, got 'bytes'

问题:

I am trying out Apache Thrift using python 3.4 which Thrift seems to have support, since it has lib.linux-x86_64-3.4 under build directory. But I am keeping getting this error message

  File "/home/qunzi/Downloads/thrift-0.9.2/lib/py/build/lib.linux-x86_64-3.4/thrift/transport/TTransport.py", line 163, in write self.__wbuf.write(buf) TypeError: string argument expected, got 'bytes' 

Anybody knows what's going on, and possibly with a solution?

Here below is the relevant code

socket = TSocket.TSocket('localhost', 9090) transport = TTransport.TBufferedTransport(socket) protocol = TBinaryProtocol.TBinaryProtocol(transport)  client = Algo.Client(protocol) transport.open() ping_req = PingRequest() ping_resp = client.ping(ping_req) 

the whole Traceback:

  File "py3client.py", line 36, in <module>     ping_resp = client.ping(ping_req)   File "/home/qunzi/Projects/test/sample_Test/py3.4_thrift/ib/Algo.py", line 66, in ping     self.send_ping(request)   File "/home/qunzi/Projects/test/sample_Test/py3.4_thrift/ib/Algo.py", line 70, in send_ping     self._oprot.writeMessageBegin('ping', TMessageType.CALL, self._seqid)   File "/home/qunzi/Downloads/thrift-0.9.2/lib/py/build/lib.linux-x86_64-3.4/thrift/protocol/TBinaryProtocol.py", line 46, in writeMessageBegin     self.writeI32(TBinaryProtocol.VERSION_1 | type)   File "/home/qunzi/Downloads/thrift-0.9.2/lib/py/build/lib.linux-x86_64-3.4/thrift/protocol/TBinaryProtocol.py", line 111, in writeI32     self.trans.write(buff)   File "/home/qunzi/Downloads/thrift-0.9.2/lib/py/build/lib.linux-x86_64-3.4/thrift/transport/TTransport.py", line 163, in write     self.__wbuf.write(buf) TypeError: string argument expected, got 'bytes' 

回答1:

Although the question is rather dead, it looks like I have an answer :)

The current python generator of thrift (as of 0.9.3) generates code, specific to python2. At least I've just switched the gears and the code which gave me the same error, now works like a charm.

The error is caused by (implicit) treating of all string-like objects within the library like byte objects. However, in Python3 StringIO class expects char-oriented strings (str) and those byte-oriented strings cause the exception.

One should file a bug to the Thrift tracker, and for now he/she should use Python2 instead.

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