grpc tensor convert not valid for python 2

[ukclivecox]

018-11-19,15:25:47.485 ERROR {_server} [_call_behavior] Exception calling application: 'memoryview' object has no attribute '__buffer__'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/grpc/_server.py", line 389, in _call_behavior
    return behavior(argument, context), True
  File "/microservice/model_microservice.py", line 122, in Predict
    features = grpc_datadef_to_array(datadef)
  File "/microservice/microservice.py", line 124, in grpc_datadef_to_array
    features =  np.frombuffer(memoryview(c[-(sz*8):]), dtype=np.float64, count=sz, offset=0)
AttributeError: 'memoryview' object has no attribute '__buffer__'