Why do I see “cannot import name descriptor_pb2” error when using Google Protocol Buffers?

Question

When using the generated Python code from our protobuf classes, we get this error:

cannot import name descriptor_pb2

The equivalent C++ gen

Answer 1

In my case, not finding descriptor_pb2 occurred because protobuf wasn't correctly installed. In the python subdirectory of protobuf, be sure to run

python setup.py build
python setup.py test
python setup.py install (as root)