service_conteinter.py

import inspect
from abc import abstractmethod


class BaseService:

    @abstractmethod
    def info(self):
        return 'this is the base service'


class Service(BaseService):
    def info(self):
        return 'this is the service'


class HttpService(BaseService):
    def info(self):
        return 'this is the Http Service'


class OrmService(BaseService):
    def info(self):
        return 'this is the Orm Service'


def injectable(func):

    def list_of_services():
        return {
            'http_service': HttpService(),
            'orm_service': OrmService(),
        }

    def inner(*args, **kwargs):
        arguments = inspect.getfullargspec(func).args

        for arg in arguments:
            # Get the base service.
            if arg == 'service':
                kwargs['service'] = Service()
                continue

            # Try to get a service from a predefined list of services.
            if arg in list_of_services():
                kwargs[arg] = list_of_services()[arg]
                continue

        func(*args, **kwargs)
    return inner


@injectable
def very_important_function(simple_variable, http_service, orm_service):
    print(simple_variable)
    print(orm_service.info())
    print(http_service.info())


# Will output:
#   this is a simple variable
#   this is the Orm Service
#   this is the Http Service
very_important_function("this is a simple variable")