golang怎么帮助Python

syntax = "proto3";

package calculator;

message Request {
  int32 number1 = 1;
  int32 number2 = 2;
  string operation = 3;
}

message Response {
  int32 result = 1;
}

$ protoc calculator.proto --go_out=./go/ --python_out=./python/

package main

import (
    "context"
    "log"
    "net"

    "google.golang.org/grpc"
    pb "github.com/username/calculator/go/proto"
)

const (
    port = ":50051"
)

type server struct {
    pb.UnimplementedCalculatorServer
}

func (s *server) Calculate(ctx context.Context, in *pb.Request) (*pb.Response, error) {
    var result int32
    switch in.Operation {
    case "add":
        result = in.Number1 + in.Number2
    case "sub":
        result = in.Number1 - in.Number2
    case "mul":
        result = in.Number1 * in.Number2
    case "div":
        result = in.Number1 / in.Number2
    default:
        return nil, fmt.Errorf("Invalid operation:%s", in.Operation)
    }
    return &pb.Response{Result: result}, nil
}

func main() {
    lis, err := net.Listen("tcp", port)
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    pb.RegisterCalculatorServer(s, &server{})
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

import grpc
import calculator_pb2
import calculator_pb2_grpc

def run():
    with grpc.insecure_channel('localhost:50051') as channel:
        stub = calculator_pb2_grpc.CalculatorStub(channel)
        number1 = int(input("Enter number1:"))
        number2 = int(input("Enter number2:"))
        operation = input("Enter operation (add/sub/mul/div):")
        response = stub.Calculate(calculator_pb2.Request(number1=number1, number2=number2, operation=operation))
    print(response.result)

if __name__ == '__main__':
    run()

$ go run calculator.go

$ python client.py
Enter number1: 10
Enter number2: 3
Enter operation (add/sub/mul/div): div
3