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import abc class CalcCmdAbs(metaclass=abc.ABCMeta): def __init__(self, *args, **kwargs): self._args = args self._kwargs = kwargs @property @abc.abstractmethod def name(self): raise NotImplemented() def execute(self): raise NotImplemented() from .interface import CalcCmdAbs OPERATORS = list() def register_operator(cls): OPERATORS.append(cls) return cls @register_operator class AddCmd(CalcCmdAbs): name = "add" def __init__(self, a, b): super().__init__(a, b) self.a = a self.b = b def execute(self): return self.a + self.b @register_operator class SubtractCmd(CalcCmdAbs): name = "subtract" def __init__(self, a, b): super()....

import os import shutil from io import BytesIO from zipfile import ZipFile from django.core.files.storage import FileSystemStorage from django.http import HttpResponse from django.conf import settings local_storage = FileSystemStorage() class ZipResponseMixin: def response(self, request, files: list, folder_name: str) -> HttpResponse: """Zip Response Generate a zip file from given file list and return Http response (Force download) :param request: request Object :param files: list of file like objects saved in models :param folder_name: desired folder name :return: """ folder_abs_path = f"{settings....