{"id":4742,"date":"2025-08-23T15:24:23","date_gmt":"2025-08-23T15:24:23","guid":{"rendered":"https:\/\/uplatz.com\/blog\/?p=4742"},"modified":"2025-08-27T03:03:41","modified_gmt":"2025-08-27T03:03:41","slug":"django-pocket-book","status":"publish","type":"post","link":"https:\/\/uplatz.com\/blog\/django-pocket-book\/","title":{"rendered":"Django Pocket Book"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/18-1024x576.png\" alt=\"Django Pocket Book\" width=\"840\" height=\"473\" class=\"alignnone size-large wp-image-4850\" srcset=\"https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/18-1024x576.png 1024w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/18-300x169.png 300w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/18-768x432.png 768w, https:\/\/uplatz.com\/blog\/wp-content\/uploads\/2025\/08\/18.png 1280w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><br \/>\n<!-- Django Pocket Book \u2014 Uplatz (50 Cards, Wide Layout, Readable Code, Scoped Styles) --><\/p>\n<div style=\"margin: 16px 0;\">\n<style>\n    .wp-nodejs-pb { font-family: Arial, sans-serif; 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border:1px solid #e2e8f0; }\n    .wp-nodejs-pb pre{\n      background:#f5f5f5; color:#111827; border:1px solid #e5e7eb;\n      padding:12px; border-radius:8px; overflow:auto; font-size:.92rem; line-height:1.55;\n    }\n    .q{font-weight:700;}<\/p>\n<p>    \/* Make long Q&A easier to scan inside a card *\/\n    .qa p{ margin:8px 0; }\n    .qa b{ color:#0f172a; }\n  <\/style>\n<div class=\"wp-nodejs-pb\">\n<div class=\"heading\">\n<h2>Django Pocket Book \u2014 Uplatz<\/h2>\n<p>50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples<\/p>\n<\/p><\/div>\n<div class=\"grid\">\n      <!-- ===================== SECTION 1 ===================== --><\/p>\n<div class=\"section-title\">Section 1 \u2014 Fundamentals<\/div>\n<div class=\"card bg-blue\">\n<h3>1) What is Django?<\/h3>\n<p>Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It follows the MTV (Model\u2013Template\u2013View) architecture, ships with an ORM, admin, authentication, forms, and security protections out of the box. Sweet spots: data-driven apps, dashboards, CMS\/CRUD, APIs with DRF. For ultra-low-latency microservices, consider lighter stacks \u2014 but Django scales well with proper caching, DB tuning, and async where appropriate.<\/p>\n<pre><code class=\"mono\"># Check your Django & Python\r\npython -V\r\npython -m django --version<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>2) Why Django? Core Strengths &#038; Tradeoffs<\/h3>\n<p>Strengths: batteries-included, stable APIs, secure defaults (CSRF, XSS, clickjacking), powerful admin, robust ORM and migrations. Tradeoffs: opinionated structure, heavier than microframeworks, template-first by default. Mitigate with modular apps, environment-driven settings, and selective third-party packages.<\/p>\n<pre><code class=\"mono\"># Create a project quickly\r\npython -m venv .venv &amp;&amp; source .venv\/bin\/activate\r\npip install django\r\ndjango-admin startproject config .\r\npython manage.py startapp core<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>3) Request\u2013Response Lifecycle: Mental Model<\/h3>\n<p>Incoming request \u2192 URL resolver \u2192 middleware stack \u2192 view \u2192 ORM\/templates \u2192 response \u2192 middleware (outbound) \u2192 server. Know where auth, sessions, and CSRF run, and how streaming responses bypass template rendering. Use this to reason about where to log, cache, or short-circuit work.<\/p>\n<pre><code class=\"mono\"># urls.py\r\nfrom django.urls import path\r\nfrom core.views import ping\r\nurlpatterns = [ path(\"health\/\", ping) ]<\/code><\/pre>\n<p class=\"muted\">Map URLs early; keep views slim; push heavy work to services\/tasks.<\/p>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>4) WSGI vs ASGI<\/h3>\n<p>WSGI powers classic sync Django; ASGI enables async views, long-lived connections, and websockets (via Channels). Django runs in both; mixing sync DB work in async views creates thread hops \u2014 keep DB operations in sync contexts or use async drivers judiciously.<\/p>\n<pre><code class=\"mono\"># asgi.py (generated by startproject)\r\nfrom django.core.asgi import get_asgi_application\r\napplication = get_asgi_application()<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>5) Django vs Flask\/FastAPI<\/h3>\n<p>Django: full-stack with ORM, admin, auth, forms; great for CRUD and teams. Flask: micro, flexible, bring-your-own libs. FastAPI: async-first, typed schemas via Pydantic, great for APIs. Choose Django when you want batteries and convention; integrate DRF for APIs.<\/p>\n<pre><code class=\"mono\"># Install DRF for Django APIs\r\npip install djangorestframework\r\n# settings.py\r\nINSTALLED_APPS += [\"rest_framework\"]<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>6) pip, venv, Poetry<\/h3>\n<p>Use virtual environments to isolate deps; pin versions with <code>pip-tools<\/code> or Poetry. Commit lock files for reproducible deploys and mirror your prod Python version locally.<\/p>\n<pre><code class=\"mono\">pip install \"django&lt;=5.1\" pip-tools\r\npip-compile requirements.in\r\npip-sync requirements.txt<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>7) settings.py &#038; Env Config<\/h3>\n<p>Settings vary by environment. Keep secrets out of VCS and validate required env vars on boot. Split settings into modules or use <code>django-environ<\/code>\/<code>pydantic-settings<\/code> for typed config.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nimport environ; env = environ.Env(DEBUG=(bool, False))\r\nDEBUG = env(\"DEBUG\")\r\nALLOWED_HOSTS = env.list(\"ALLOWED_HOSTS\", default=[])<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>8) LTS vs Latest<\/h3>\n<p>Django publishes LTS releases with extended support. Prefer LTS for long-lived products; test against the latest in CI to prepare for upgrades. Upgrade minor releases frequently for security fixes.<\/p>\n<pre><code class=\"mono\"># Pin version\r\necho \"Django==5.0.*\" &gt;&gt; requirements.in\r\npip-compile &amp;&amp; pip-sync<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>9) pyenv &#038; Multi-Version Dev<\/h3>\n<p>Install multiple Python versions with pyenv and per-project <code>.python-version<\/code>. Align CI and prod. Use <code>tox<\/code> to test across supported Python\/Django matrices.<\/p>\n<pre><code class=\"mono\">pyenv install 3.12.5\r\npyenv local 3.12.5<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>10) Q&amp;A \u2014 \u201cIs Django synchronous or asynchronous?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Both. Django supports sync (WSGI) and async (ASGI) entry points. Views can be <code>def<\/code> or <code>async def<\/code>; middleware likewise. DB backends are primarily sync, so async views doing ORM work hop to threads. For websockets\/long I\/O, use ASGI + Channels.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 2 ===================== --><\/p>\n<div class=\"section-title\">Section 2 \u2014 Core APIs &#038; Modules<\/div>\n<div class=\"card bg-blue\">\n<h3>11) URLconf &#038; Routing<\/h3>\n<p>Define URL patterns with <code>path<\/code> and <code>re_path<\/code>. Keep project <code>urls.py<\/code> thin and include app routes. Name your URLs for reverse lookups in templates and redirects.<\/p>\n<pre><code class=\"mono\"># core\/urls.py\r\nfrom django.urls import path\r\nfrom . import views\r\nurlpatterns = [ path(\"hello\/\", views.hello, name=\"hello\") ]<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>12) Models &#038; ORM Essentials<\/h3>\n<p>Django models map to tables; fields map to columns with validation. Use constraints, unique indexes, and choices enums. Keep business logic in model methods\/managers.<\/p>\n<pre><code class=\"mono\"># core\/models.py\r\nfrom django.db import models\r\nclass User(models.Model):\r\n    email = models.EmailField(unique=True)\r\n    created_at = models.DateTimeField(auto_now_add=True)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>13) Views &#038; HttpResponse<\/h3>\n<p>Function-based views (FBV) are simple; class-based views (CBV) provide reuse. Always return <code>HttpResponse<\/code>\/<code>JsonResponse<\/code> and handle methods explicitly.<\/p>\n<pre><code class=\"mono\"># core\/views.py\r\nfrom django.http import JsonResponse\r\ndef hello(_):\r\n    return JsonResponse({\"ok\": True})<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>14) QuerySets &#038; Managers<\/h3>\n<p>QuerySets are lazy, chainable, and composable. Push filtering\/ordering to DB. Use <code>.only()<\/code>\/<code>.defer()<\/code> to trim columns; write custom managers for common scopes.<\/p>\n<pre><code class=\"mono\">from core.models import User\r\nusers = User.objects.filter(email__endswith=\"@example.com\").order_by(\"-created_at\")<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>15) Migrations<\/h3>\n<p>Migrations track schema changes. Run <code>makemigrations<\/code> then <code>migrate<\/code>. Use <code>RunPython<\/code> for data migrations; keep them idempotent and reversible.<\/p>\n<pre><code class=\"mono\">python manage.py makemigrations\r\npython manage.py migrate<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>16) Admin Customization<\/h3>\n<p>The admin offers instant CRUD. Register models, customize list displays, actions, and fieldsets. Lock down access with staff\/superuser and permissions.<\/p>\n<pre><code class=\"mono\"># core\/admin.py\r\nfrom django.contrib import admin\r\nfrom .models import User\r\n@admin.register(User)\r\nclass UserAdmin(admin.ModelAdmin):\r\n    list_display = (\"email\",\"created_at\")<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>17) Forms &#038; ModelForms<\/h3>\n<p>Forms validate user input; ModelForms tie to models. Prefer server-side validation even when using JS. Use <code>clean_*<\/code> methods for field logic.<\/p>\n<pre><code class=\"mono\">from django import forms\r\nfrom .models import User\r\nclass UserForm(forms.ModelForm):\r\n    class Meta: model = User; fields = [\"email\"]<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>18) Middleware<\/h3>\n<p>Middleware wraps requests\/responses (security, sessions, auth). Keep it fast and stateless. Use it for cross-cutting concerns (headers, logging), not business logic.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nMIDDLEWARE += [\"django.middleware.security.SecurityMiddleware\"]<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>19) Static &#038; Media Files<\/h3>\n<p>Collect static assets with <code>collectstatic<\/code> to a single location for serving via CDN\/Whitenoise. Store user uploads on S3\/Cloud Storage with signed URLs.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nSTATIC_URL = \"\/static\/\"; MEDIA_URL = \"\/media\/\"\r\nSTATIC_ROOT = BASE_DIR \/ \"staticfiles\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>20) Q&amp;A \u2014 \u201cFBV or CBV?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Use FBV for simple endpoints; switch to CBV when you benefit from mixins (<code>ListView<\/code>, <code>CreateView<\/code>) or need reuse\/overrides. For APIs, DRF viewsets mix in auth, throttling, and serialization ergonomically.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 3 ===================== --><\/p>\n<div class=\"section-title\">Section 3 \u2014 Async, Patterns &#038; Concurrency<\/div>\n<div class=\"card bg-blue\">\n<h3>21) Async Views<\/h3>\n<p>Django supports <code>async def<\/code> views\/middleware. Use for I\/O-bound work (HTTP calls) with <code>httpx<\/code>. Database ORM is sync; avoid mixing long async with blocking DB calls.<\/p>\n<pre><code class=\"mono\"># async view\r\nfrom django.http import JsonResponse\r\nimport httpx\r\nasync def joke(_):\r\n    async with httpx.AsyncClient(timeout=2) as c:\r\n        r = await c.get(\"https:\/\/api.example.com\")\r\n    return JsonResponse(r.json())<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>22) Class-Based Views Patterns<\/h3>\n<p>Leverage mixins (<code>LoginRequiredMixin<\/code>, CRUD mixins) to DRY up common behavior. Override <code>get_queryset<\/code>\/<code>form_valid<\/code> selectively. Keep templates cohesive with CBV context.<\/p>\n<pre><code class=\"mono\">from django.views.generic import ListView\r\nfrom .models import User\r\nclass UserList(ListView): model = User; paginate_by = 20<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>23) Transactions &#038; Atomicity<\/h3>\n<p>Use <code>@transaction.atomic<\/code> to bundle operations; avoid partial writes. For idempotency, guard unique constraints and handle <code>IntegrityError<\/code> cleanly.<\/p>\n<pre><code class=\"mono\">from django.db import transaction\r\n@transaction.atomic\r\ndef create_user(email):\r\n    ...<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>24) select_related vs prefetch_related<\/h3>\n<p><code>select_related<\/code> joins on FK\/OneToOne, <code>prefetch_related<\/code> issues separate queries and stitches in Python for M2M\/reverse. Use the right one to kill N+1 queries.<\/p>\n<pre><code class=\"mono\">User.objects.select_related(\"profile\").prefetch_related(\"groups\")<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>25) Celery for Background Jobs<\/h3>\n<p>Offload CPU\/slow I\/O to Celery workers (Redis\/RabbitMQ broker). Add retries with exponential backoff and dead-letter queues; keep tasks idempotent.<\/p>\n<pre><code class=\"mono\"># tasks.py\r\nfrom celery import shared_task\r\n@shared_task(bind=True, max_retries=3)\r\ndef send_email_task(user_id): ...<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>26) Channels &#038; WebSockets<\/h3>\n<p>Django Channels brings websockets and background consumers atop ASGI. Use Redis as the channel layer; scale horizontally with sticky sessions or shared layer.<\/p>\n<pre><code class=\"mono\"># asgi.py includes ProtocolTypeRouter\r\n# routing.py maps websocket URL patterns to consumers<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>27) Caching in Practice<\/h3>\n<p>Use per-view, template fragment, or low-level caching. Backends: LocMem (dev), Memcached, Redis. Add cache keys with versioning and invalidate on writes.<\/p>\n<pre><code class=\"mono\">from django.views.decorators.cache import cache_page\r\n@cache_page(60)  # 60s\r\ndef stats(request): ...<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>28) Rate Limits &#038; Throttling<\/h3>\n<p>For APIs, DRF throttles per user\/IP. For sites, <code>django-ratelimit<\/code> helps guard forms and auth. Always return 429 with hints.<\/p>\n<pre><code class=\"mono\"># DRF settings\r\nREST_FRAMEWORK = { \"DEFAULT_THROTTLE_RATES\": { \"anon\":\"100\/hour\",\"user\":\"1000\/hour\" } }<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>29) External Calls: Timeouts &#038; Retries<\/h3>\n<p>Always set timeouts, use exponential backoff with jitter, and bound concurrency. Wrap calls and surface metrics.<\/p>\n<pre><code class=\"mono\">import httpx, backoff\r\n@backoff.on_exception(backoff.expo, httpx.HTTPError, max_time=8)\r\ndef fetch(url): return httpx.get(url, timeout=2)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>30) Q&amp;A \u2014 \u201cCelery vs cron?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> Use Celery for distributed, retryable tasks, scheduled or on-demand, with result tracking. Use system cron for simple, single-host jobs with no retries\/state. Many teams use Celery beat (or Django-Q\/RQ) for schedules.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 4 ===================== --><\/p>\n<div class=\"section-title\">Section 4 \u2014 Frameworks, Data &#038; APIs<\/div>\n<div class=\"card bg-blue\">\n<h3>31) Django REST Framework (DRF)<\/h3>\n<p>DRF adds serializers, viewsets, routers, browsable API, throttles, and auth. Define explicit schemas and use generics for CRUD to move fast.<\/p>\n<pre><code class=\"mono\"># api\/views.py\r\nfrom rest_framework import viewsets, serializers\r\nfrom core.models import User\r\nclass UserSer(serializers.ModelSerializer):\r\n    class Meta: model = User; fields = [\"id\",\"email\"]\r\nclass UserView(viewsets.ModelViewSet):\r\n    queryset = User.objects.all(); serializer_class = UserSer<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>32) DRF Routers &#038; Permissions<\/h3>\n<p>Routers auto-wire CRUD endpoints. Apply <code>IsAuthenticated<\/code>\/<code>DjangoModelPermissions<\/code> and per-action overrides. Add pagination and filtering.<\/p>\n<pre><code class=\"mono\"># api\/urls.py\r\nfrom rest_framework.routers import DefaultRouter\r\nfrom .views import UserView\r\nrouter = DefaultRouter(); router.register(\"users\", UserView)\r\nurlpatterns = router.urls<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>33) GraphQL with Graphene<\/h3>\n<p>Graphene integrates Django models into GraphQL schemas. Add complexity\/depth limits, and batch N+1 with <code>graphene-django-optimizer<\/code>.<\/p>\n<pre><code class=\"mono\"># schema.py\r\nimport graphene\r\nclass Query(graphene.ObjectType):\r\n    hello = graphene.String()\r\n    def resolve_hello(root, info): return \"world\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>34) REST Design (DRF)<\/h3>\n<p>Use nouns, filtering, pagination, and proper status codes. Validate with serializers; document with OpenAPI\/Swagger (<code>drf-spectacular<\/code>\/<code>drf-yasg<\/code>).<\/p>\n<pre><code class=\"mono\"># settings.py\r\nREST_FRAMEWORK = { \"DEFAULT_SCHEMA_CLASS\":\"drf_spectacular.openapi.AutoSchema\" }<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>35) Serialization &#038; Validation<\/h3>\n<p>Prefer ModelSerializer for CRUD; write custom <code>validate_*<\/code> and <code>validate<\/code> for cross-field logic. Keep serializers slim; avoid heavy side-effects in <code>create<\/code>\/<code>update<\/code>.<\/p>\n<pre><code class=\"mono\">class RegisterSer(serializers.Serializer):\r\n    email = serializers.EmailField()<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>36) Real-Time with Channels<\/h3>\n<p>Use groups to broadcast events, auth via tokens\/sessions, and back messages with Redis. For presence, expire keys with TTL.<\/p>\n<pre><code class=\"mono\"># consumer skeleton\r\nfrom channels.generic.websocket import AsyncWebsocketConsumer\r\nclass Chat(AsyncWebsocketConsumer): ...<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>37) PostgreSQL Tips<\/h3>\n<p>Use strong constraints, composite indexes, and <code>EXPLAIN ANALYZE<\/code>. Prefer UUID PKs (<code>django.contrib.postgres<\/code> extras), and transactions for bulk writes.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nDATABASES[\"default\"][\"CONN_MAX_AGE\"] = 60<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange\">\n<h3>38) Search Integration<\/h3>\n<p>For simple needs, use <code>icontains<\/code>\/<code>trigram similarity<\/code>. For full-text, wire Elasticsearch or OpenSearch using <code>django-elasticsearch-dsl<\/code>.<\/p>\n<pre><code class=\"mono\"># example: trigram extension (Postgres)\r\n# CREATE EXTENSION pg_trgm;<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-indigo\">\n<h3>39) i18n &#038; l10n<\/h3>\n<p>Mark strings for translation, compile messages, and detect language via middleware. Localize dates\/numbers in templates.<\/p>\n<pre><code class=\"mono\">{% load i18n %}\r\n{% trans \"Hello\" %}<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-emerald\">\n<h3>40) Q&amp;A \u2014 \u201cREST or GraphQL?\u201d<\/h3>\n<p><span class=\"q\">Answer:<\/span> REST is simpler and CDN-friendly; DRF gives you CRUD fast. GraphQL shines for complex UIs needing flexible shapes. Many teams expose REST publicly and use GraphQL internally.<\/p>\n<\/p><\/div>\n<p>      <!-- ===================== SECTION 5 ===================== --><\/p>\n<div class=\"section-title\">Section 5 \u2014 Security, Testing, Deployment, Observability &#038; Interview Q&amp;A<\/div>\n<div class=\"card bg-blue\">\n<h3>41) Security Fundamentals<\/h3>\n<p>Django ships CSRF, XSS, and clickjacking protection. Enforce HTTPS, HSTS, secure cookies, strict <code>ALLOWED_HOSTS<\/code>, and rotated secrets. Validate all input server-side.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nSECURE_HSTS_SECONDS = 31536000\r\nSESSION_COOKIE_SECURE = CSRF_COOKIE_SECURE = True<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-green\">\n<h3>42) Auth, Users &#038; Permissions<\/h3>\n<p>Use the pluggable user model from day one. Leverage groups\/permissions, per-object perms, and DRF permission classes. Rotate sessions on privilege changes.<\/p>\n<pre><code class=\"mono\"># settings.py\r\nAUTH_USER_MODEL = \"core.User\"<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-amber\">\n<h3>43) Testing Strategy<\/h3>\n<p>Use <code>pytest-django<\/code> for fast tests, factories for fixtures, and RequestFactory\/APIClient for views. Mix unit\/integration; use a dedicated test DB with migrations faked when speed matters.<\/p>\n<pre><code class=\"mono\">pip install pytest pytest-django\r\npytest -q<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-violet\">\n<h3>44) Linting, Formatting &#038; Types<\/h3>\n<p>Adopt Black, Ruff\/Flake8, isort, and mypy with <code>django-stubs<\/code>. Run in CI (<code>pre-commit<\/code>) and keep type hints in services, serializers, and utils.<\/p>\n<pre><code class=\"mono\">pip install black ruff mypy django-stubs pre-commit\r\npre-commit install<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-rose\">\n<h3>45) Performance &#038; Profiling<\/h3>\n<p>Measure with Django Debug Toolbar, Silk, and query logs. Kill N+1 with prefetch\/select, use caching, and paginate aggressively. Template fragment cache hot components.<\/p>\n<pre><code class=\"mono\"># Example: log slow queries in dev\r\nLOGGING = { \"handlers\": ..., \"loggers\": {\"django.db.backends\": {\"level\":\"DEBUG\"}} }<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-cyan\">\n<h3>46) Deployment Options<\/h3>\n<p>WSGI: Gunicorn + Nginx. ASGI: Uvicorn\/Daphne. Serve static via CDN\/Whitenoise. Use container images pinned to Python, run health checks, and graceful shutdown.<\/p>\n<pre><code class=\"mono\"># Dockerfile\r\nFROM python:3.12-slim\r\nWORKDIR \/app\r\nCOPY requirements.txt .\r\nRUN pip install -r requirements.txt\r\nCOPY . .\r\nCMD [\"gunicorn\",\"config.wsgi:application\",\"-b\",\"0.0.0.0:8000\",\"-w\",\"3\"]<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-lime\">\n<h3>47) Observability<\/h3>\n<p>Structured logging (JSON), request IDs, APM (Sentry\/Elastic APM), metrics (Prometheus + django-prometheus), and tracing (OpenTelemetry). Expose health\/readiness endpoints.<\/p>\n<pre><code class=\"mono\">pip install sentry-sdk\r\nimport sentry_sdk; sentry_sdk.init(dsn=..., traces_sample_rate=0.2)<\/code><\/pre>\n<\/p><\/div>\n<div class=\"card bg-orange tight\">\n<h3>48) Prod Checklist<\/h3>\n<ul>\n<li>Env-driven settings &#038; secrets manager<\/li>\n<li>HTTPS, HSTS, CSRF, secure cookies<\/li>\n<li>Sane timeouts for external calls<\/li>\n<li>DB connections pooled; indexes verified<\/li>\n<li>Caching: per-view\/fragment + CDN<\/li>\n<li>Alerting on error rate\/latency\/SLOs<\/li>\n<\/ul><\/div>\n<div class=\"card bg-indigo\">\n<h3>49) Common Pitfalls<\/h3>\n<p>Doing heavy work in requests (no task queue), N+1 queries, storing files locally in ephemeral containers, missing <code>ALLOWED_HOSTS<\/code>\/secure cookies, and ignoring migrations conflicts. Prevent with reviews, linters, tests, and observability.<\/p>\n<\/p><\/div>\n<div class=\"card bg-emerald qa\">\n<h3>50) Interview Q&amp;A \u2014 20 Practical Questions (Expanded)<\/h3>\n<p><b>1) Why Django for CRUD apps?<\/b> Batteries-included ORM\/admin\/forms\/security accelerate delivery while keeping consistency.<\/p>\n<p><b>2) MTV vs MVC?<\/b> Django\u2019s View handles \u201ccontroller\u201d logic; Templates are the \u201cview\u201d; Models match models \u2014 terminology difference, same separation.<\/p>\n<p><b>3) Sync vs async?<\/b> Django supports both; use ASGI for websockets\/long I\/O; most DB work is sync.<\/p>\n<p><b>4) Kill N+1?<\/b> Use <code>select_related<\/code>\/<code>prefetch_related<\/code>, annotate counts, and profile queries.<\/p>\n<p><b>5) Custom user model?<\/b> Create on day one to avoid migration pain; swap <code>AUTH_USER_MODEL<\/code>.<\/p>\n<p><b>6) Where to put business logic?<\/b> Services\/domain modules or model methods\/managers; keep views thin.<\/p>\n<p><b>7) Forms vs serializers?<\/b> Forms for HTML; DRF serializers for APIs; both validate.<\/p>\n<p><b>8) Static vs media?<\/b> Static = versioned assets; media = user uploads; serve via CDN\/object storage.<\/p>\n<p><b>9) CSRF on APIs?<\/b> Use session-based CSRF for browser clients; for token\/JWT APIs, exempt and rely on CORS + auth.<\/p>\n<p><b>10) Caching strategy?<\/b> Layered: per-view\/fragment, Redis\/Memcached, CDN; invalidate on writes.<\/p>\n<p><b>11) DRF auth?<\/b> Session for same-site, Token\/JWT for APIs; apply permission classes and throttles.<\/p>\n<p><b>12) File uploads?<\/b> Use storage backends (S3) with signed URLs; avoid serving from app containers.<\/p>\n<p><b>13) Signals usage?<\/b> For decoupled side-effects (audit), but don\u2019t hide core business flows.<\/p>\n<p><b>14) Migrations conflicts?<\/b> Rebase and <code>--empty<\/code>\/<code>--merge<\/code> when necessary; keep migrations small.<\/p>\n<p><b>15) Multi-tenant?<\/b> Separate schemas\/dbs, or row-level scoping with constraints and queries.<\/p>\n<p><b>16) Handling long tasks?<\/b> Celery workers + beat schedules; expose task IDs and status.<\/p>\n<p><b>17) Serving at scale?<\/b> Gunicorn\/Uvicorn behind Nginx, autoscale containers, shared cache\/DB, and health checks.<\/p>\n<p><b>18) Env management?<\/b> <code>django-environ<\/code> or typed settings; never commit secrets.<\/p>\n<p><b>19) Templates vs Jinja2?<\/b> Django templates are safe and integrated; Jinja2 is faster\/flexible \u2014 pick per project.<\/p>\n<p><b>20) Monitoring?<\/b> Sentry for errors, Prometheus for metrics, logs with request IDs, and alerts on SLO burn.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Django Pocket Book \u2014 Uplatz 50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples Section 1 \u2014 Fundamentals 1) What is Django? <span class=\"readmore\"><a href=\"https:\/\/uplatz.com\/blog\/django-pocket-book\/\">Read More &#8230;<\/a><\/span><\/p>\n","protected":false},"author":2,"featured_media":4850,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2512,2462],"tags":[],"class_list":["post-4742","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-django","category-pocket-book"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Django Pocket Book | Uplatz Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uplatz.com\/blog\/django-pocket-book\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Django Pocket Book | Uplatz Blog\" \/>\n<meta property=\"og:description\" content=\"Django Pocket Book \u2014 Uplatz 50 deep-dive flashcards \u2022 Wide layout \u2022 Fewer scrolls \u2022 20+ Interview Q&amp;A \u2022 Readable code examples Section 1 \u2014 Fundamentals 1) What is Django? 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