python

from django.db import models
from django.core.exceptions import ValidationError
from django.utils import timezone


class Event(models.Model):

# Find products with specific spec value
products = Product.objects.filter(specs__weight__gte=100)

# Check if JSON key exists
products = Product.objects.filter(specs__has_key='color')

from products.models import Product


def import_products_bulk(product_data):
    """Import thousands of products efficiently."""
    products = [

from rest_framework import serializers
from .models import Author, Book


class BookSerializer(serializers.ModelSerializer):
    class Meta:

import asyncio
import time
from dataclasses import dataclass, field


@dataclass

import pandas as pd

df = pd.read_csv(
    'orders.csv',
    parse_dates=['created_at'],
    dtype={

from django.db import models


class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()

import abc
from typing import IO


class Exporter(abc.ABC):
    name: str = ""

from django.db import migrations


def populate_slugs(apps, schema_editor):
    """Generate slugs for existing posts."""
    Post = apps.get_model('blog', 'Post')

import random


class ReadWriteRouter:
    """Route reads to replicas, writes to primary."""

from blog.models import Post


# Load only specific fields
posts = Post.objects.only('id', 'title', 'published_at')
for post in posts:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydb',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',