PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp and ImportError: cannot import name _message

[Yan Yan]

It failed when I set "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp". It works when I don't set it.

osboxes@centos7_rpc4 ~/Downloads/github.com/grpc/grpc/examples/python/route_guide

$ export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp

osboxes@centos7_rpc4 ~/Downloads/github.com/grpc/grpc/examples/python/route_guide

$ python ./route_guide_server.py

I0723 11:17:54.675572992   54257 ev_epoll_linux.c:85]        epoll engine will be using signal: 36

D0723 11:17:54.675605774   54257 ev_posix.c:106]             Using polling engine: epoll

Traceback (most recent call last):

  File "./route_guide_server.py", line 35, in <module>

    import route_guide_pb2

  File "/home/osboxes/Downloads/github.com/grpc/grpc/examples/python/route_guide/route_guide_pb2.py", line 6, in <module>

    from google.protobuf import descriptor as _descriptor

  File "/usr/lib/python2.7/site-packages/protobuf-3.0.0b3-py2.7.egg/google/protobuf/descriptor.py", line 46, in <module>

    from google.protobuf.pyext import _message

ImportError: cannot import name _message