Python code explainers

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
 

from django.conf import settings
from django.contrib.auth import get_user_model
from django.core.mail import EmailMultiAlternatives
from django.db.models.signals import post_save

import csv
import io
from datetime import date
 

import json
import logging
 
import stripe

from collections import deque
 
 
class RollingAverage:

from collections import OrderedDict
from typing import Callable, Hashable, Iterable, Iterator, TypeVar
 
T = TypeVar("T")

from django.db.models import Sum, Count, F, DecimalField
from django.db.models.functions import TruncMonth, Coalesce
 
from .models import Order

from pathlib import Path
 
 
def print_tree(root, prefix="", show_hidden=False):