Error while generating grpc code in python, unable to import *_pb.py file into *_pb_grpc.py

Question

I have the following project structure:

|-definitions
|--dummy_grpc
|----dummy_grpc.proto
|-python_client

What I'm trying to do is generating the dummy_grpc.proto inside the python_client folder and then use the library(? probably is not even the correct word to describe a package) in other project by importing from github.
So in root of the project I have created a simple script to generate the code:

"""Runs protoc with the gRPC plugin to generate messages and gRPC stubs."""

from grpc_tools import protoc

protoc.main((
    '',
    '-Idefinitions/dummy_grpc/',
    '--python_out=python_client',
    '--grpc_python_out=python_client',
    'definitions/dummy_grpc/dummy_grpc.proto',
))

The script run and it creates two files inside python_client folder: dummy_grpc_pb2_grpc.py and dummy_grpc_pb2.py . The first file import the second file but, for some reason is not to import the file (error is ```Unable to import file), the import looks like:

import dummy_grpc_pb2 as dummy__grpc__pb2

I was thinking that maybe python is not able to see the file so I created a init .py inside python_client folder but with no luck. Any suggestion?