protocol-exemplo-1.py

from abc import abstractmethod
from typing import List, Protocol
from dataclasses import dataclass


@dataclass
class Customer:
    id: int
    name: str


class CustomerRepository(Protocol):

    @abstractmethod
    def get_customers(self) -> List[Customer]:
        """ retorna uma lista de clientes"""

    @abstractmethod
    def get_special_customers(self) -> List[Customer]:
        """ retorna uma lista de clientes especiais"""


class MongoCustomerRepository:

    def get_customers(self) -> List[Customer]:
        print("mongo repository")
        return [Customer(1, 'xpto'), Customer(2, 'foo bar')]


def ExemploService(cr: CustomerRepository):
    print(*cr.get_customers(), sep='\n')


if __name__ == '__main__':
    mc = MongoCustomerRepository()
    ExemploService(mc)