Wrong import syntax generated by grpc-tools

This demo is set up with Poetry but you could use regular virtual env, these are the demo project dependencies:

python = "^3.8.2"
grpcio-tools = "^1.28.1"
grpcio = "^1.28.1"

The problem

When you run this command

poetry run python3 -m grpc_tools.protoc -I./ --python_out=./demo --grpc_python_out=./demo ./demo.proto

the resulting generated files demo_pb2.py and demo_pb2_grpc.py are generated without any errors.

However, demo_pb2_grpc.py imports demo_pb2_grpc.py as follows:
import demo_pb2 as demo__pb2
and I believe for python 3 it should be like this
from . import demo_pb2 as demo__pb2

This causes:

• pylint(2.5.2) to indicate error
• it also breaks during runtime if you run python REPL here and try to import demo it will fail on that line of code with "No module named demo_pb2" caused in demo_pb2_grpc.py file.