medium_grpc_server.py

import grpc

from protos.user_store_pb2 import User, UserResponse, UserEmailRequest,
from protos.user_store_pb2_grpc import UserStoreServicer


class UserStoreServicer(UserStoreServicer):
    def GetUserDataByEmail(self, request: UserEmailRequest, context):
        user = … # your code for fetching the user data
        return UserResponse(
            user=User(
                email=user.email,
                firstname=user.firstname,
                lastname=user.lastname
            )
        )