My code exhibits the same problem as the example helloworld:

zach@Roma:/DEV/STAGE/grpc/examples/python/helloworld$ python 
greeter_server.py 
Traceback (most recent call last):
  File "greeter_server.py", line 34, in <module>
    import helloworld_pb2
  File "/DEV/STAGE/grpc/examples/python/helloworld/helloworld_pb2.py", line 
112, in <module>
    from grpc.beta import implementations as beta_implementations
  File 
"/usr/local/lib/python2.7/dist-packages/grpc/beta/implementations.py", line 
39, in <module>
    from grpc import _auth
  File "/usr/local/lib/python2.7/dist-packages/grpc/_auth.py", line 43, in 
<module>
    class GoogleCallCredentials(grpc.AuthMetadataPlugin):
AttributeError: 'module' object has no attribute 'AuthMetadataPlugin'

I did ran pip install grpcio and pip install grpcio-tools

Thanks, Zach.

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