Followup-For: Bug #1072073 This looks like some kind of namespace violation in nanopb.
nanopb ships /usr/lib/python3/dist-packages/nanopb/* /usr/lib/python3/dist-packages/proto /usr/lib/python3/dist-packages/proto/__init__.py /usr/lib/python3/dist-packages/proto/_utils.py /usr/lib/python3/dist-packages/proto/google /usr/lib/python3/dist-packages/proto/google/protobuf /usr/lib/python3/dist-packages/proto/google/protobuf/descriptor.proto /usr/lib/python3/dist-packages/proto/nanopb.proto /usr/lib/python3/dist-packages/proto/nanopb_pb2.py and that proto module looks like something very specific to nanopb. Andreas
