Assuming you are in the examples
directory.
To start the server:
$ python3 -m helloworld.server
To run the client:
$ python3 -m helloworld.client
To re-generate helloworld_pb2.py
and helloworld_grpc.py
files (already generated):
$ python3 -m grpc_tools.protoc -I. --python_out=. --grpclib_python_out=. helloworld/helloworld.proto