Minimal example of a python grpc server built with bazel.

.python-grpc-bazel-example

$ bazel build ...
$ bazel run :greeter_server
Listening on :50051
$ bazel run :greeter_client
Greeter client received: Hello, you!

BUILD

load("@rules_proto//proto:defs.bzl", "proto_library")
load("@com_github_grpc_grpc//bazel:python_rules.bzl", "py_grpc_library", "py_proto_library")

proto_library(
    name = "helloworld_proto",
    srcs = ["helloworld.proto"],
)

py_proto_library(
    name = "helloworld_py_proto",
    deps = [":helloworld_proto"],
)

py_grpc_library(
    name = "helloworld_py_grpc",
    srcs = [":helloworld_proto"],
    deps = [":helloworld_py_proto"],
)

py_binary(
    name = "greeter_server",
    srcs = ["greeter_server.py"],
    deps = [":helloworld_py_grpc"],
)

py_binary(
    name = "greeter_client",
    srcs = ["greeter_client.py"],
    deps = [":helloworld_py_grpc"],
)

greeter_client.py

# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Python implementation of the GRPC helloworld.Greeter client."""

from __future__ import print_function
import logging

import grpc

import helloworld_pb2
import helloworld_pb2_grpc


def run():
    # NOTE(gRPC Python Team): .close() is possible on a channel and should be
    # used in circumstances in which the with statement does not fit the needs
    # of the code.
    with grpc.insecure_channel('localhost:50051') as channel:
        stub = helloworld_pb2_grpc.GreeterStub(channel)
        response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
    print('Greeter client received: ' + response.message)


if __name__ == '__main__':
    logging.basicConfig()
    run()

greeter_server.py

# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Python implementation of the GRPC helloworld.Greeter server."""

from concurrent import futures
import logging

import grpc

import helloworld_pb2
import helloworld_pb2_grpc


class Greeter(helloworld_pb2_grpc.GreeterServicer):
    def SayHello(self, request, context):
        print('Request from %s' % request.name)
        return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)


def serve():
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    server.add_insecure_port('[::]:50051')
    server.start()
    print('Listening on :50051')
    server.wait_for_termination()


if __name__ == '__main__':
    logging.basicConfig()
    serve()

helloworld.proto

syntax = "proto3";

service Greeter {
    rpc SayHello (HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
    string name = 1;
}

message HelloReply {
    string message = 1;
}

WORKSPACE

workspace(name = "hello")

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")

http_archive(
    name = "com_github_grpc_grpc",
    sha256 = "51403542b19e9ed5d3b6551ce4a828e17883a1593d4ca408b098f04b0767d202",
    strip_prefix = "grpc-1.36.2",
    urls = ["https://github.com/grpc/grpc/archive/v1.36.2.tar.gz"],
)

load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")

grpc_deps()

load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")

grpc_extra_deps()

I failed to build this using bazel 6.3.1 on mac. Got this error: Error: 'apple_common' value has no field or method 'objc_proto_aspect'

I added the build_bazel_rules_apple, fail with new error like:
external/com_google_absl/absl/meta/type_traits.h:293:36: error: builtin __has_trivial_destructor is deprecated; use __is_trivially_destructible instead [-Werror,-Wdeprecated-builtins]
: std::integral_constant<bool, __has_trivial_destructor(T) &&

Can you provide more information about which platform and which bazel version this can build successfully?