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from typing import Any, Mapping, Tuple, Callable


def mapping_to_choices(
    mapping: Mapping[str, Any],
    label_factory: Callable[[str], Any] = lambda v: v,
    recursive: bool = True,
) -> Tuple[Tuple[Any, Any], ...]:
    """
    Converts a mapping to Django field choices.

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class multiple_indexes(object):
    """ Mixin """
    def __getitem__(self, index):
        if not isinstance(index, tuple):
            index = (index, )
        getter = super().__getitem__
        retval = []
        for i in index:
            part = getter(i)
            if isinstance(i, slice):

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from transformation import pipeline, rename_fields, transform_field_value, replace, group_fields


if __name__ == '__main__':
    car_transformer = pipeline(
        rename_fields({"owner_yob": "owner_year_of_birth"}),
        transform_field_value("owner_year_of_birth", int),
        transform_field_value("owner_gender", replace({"female": 0, "male": 1}, None)),
        group_fields("owner", ("owner_first_name", "owner_last_name", "owner_year_of_birth", "owner_gender")),
        transform_field_value(

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'''
https://code.djangoproject.com/ticket/28960

For Python 2.x you need to delete the annotations and related imports.
'''

from ctypes import c_double, c_int

from django.contrib.gis.geos.libgeos import GEOM_PTR
from django.contrib.gis.geos.prototypes.topology import Topology

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""" 
Required:
* Python 3 (use 3.5+ or remove type hinting)
* requests (`pip3 install requests`)
"""

from typing import Optional
from urllib.parse import urljoin

from requests import Session

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class _Singleton(type):
    _instances = {}

    def __call__(cls, *pargs, **kwargs):
        mcls = cls.__class__
        if cls not in mcls._instances:
            mcls._instances[cls] = super().__call__(*pargs, **kwargs)
        return mcls._instances[cls]

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from functools import wraps


def cache_to_attr(
    cache_attr_name, with_cache_flag_kwarg_name='with_cache',
    default_with_cache_value=True,
):
    """
    Декоратор, реализующий кэширование результата вызова метода
    в атрибут экземпляра

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from django.shortcuts import get_object_or_404, _get_queryset
from django.core.exceptions import MultipleObjectsReturned, ObjectDoesNotExist


__all__ = (
    'get_object_or_create', 'get_object_or_404', 'get_object_or_none',
    'get_first_or_create', 'get_first_or_404', 'get_first_or_none',
)

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"""
Реализация `Soft delete` (удаления с поддержкой восстановления).

# ================== #
# ===== Пример ===== #
# ================== #

# --- Source: catalog.models --- #
from core.models.mixins import CUDMixin, TitleMixin
from core.models.soft_delete import SoftDeleteMixin

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from socket import timeout as TimeoutException
from http.client import HTTPConnection, HTTPException
from time import sleep
from datetime import datetime


DEFAULT_TIMEOUT_SEC = 5
DEFAULT_COUNT = None
DEFAULT_INTERVAL_SEC = 0.5