Python code explainers

from django.db import models
from django.utils.text import slugify
 
 

from functools import lru_cache
import math
 
 

import re
from collections import defaultdict
from pathlib import Path
 

import threading
import logging
 
logger = logging.getLogger(__name__)

from collections import ChainMap
from functools import reduce
from typing import Any, Iterable, Mapping
 

from fastapi import Depends, FastAPI, HTTPException
from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker
 

import re
 
_UNIT_SECONDS = {
    "w": 604800,

import csv
from collections import defaultdict
from dataclasses import dataclass, field
from decimal import Decimal, InvalidOperation

from flask import Blueprint, jsonify, request, abort
 
from .models import Article, db
from .schemas import article_schema, articles_schema

from django.core.cache import cache
from rest_framework.throttling import SimpleRateThrottle
 
 

import stripe
from fastapi import APIRouter, Request, Header, HTTPException
 
from app.config import settings

from operator import itemgetter
 
 
def sort_employees(employees):

from itertools import islice
from typing import Iterable, Iterator, TypeVar
 
T = TypeVar("T")

import time
from dataclasses import dataclass, field
 
from fastapi import Depends, FastAPI, HTTPException, Request, status

import argparse
import sys
from pathlib import Path
 

from collections.abc import Mapping
from typing import Any, Iterator
 
 

import csv
import io
from datetime import datetime
 

import time
from collections import defaultdict
from threading import Lock