Python Interview Questions and Answers
Top 100 Python Fullstack Interview Questions for Freshers
Python Full Stack Development is one of the most sought-after skills in software development, enabling developers to build complete, end-to-end web applications. Mastering Python Full Stack allows professionals to develop scalable, high-performance applications by integrating front-end, back-end, database, and cloud technologies.Candidates should be well-prepared to tackle both the Python Full Stack Online Assessment and Technical Interview Round at IDM TechPark.To help you succeed, we have compiled a comprehensive list of the Top 100 Python Full Stack Interview Questions along with their answers. Mastering these concepts will give you a strong edge in securing a Python Full Stack role and excelling in modern software development.
1. What is Python Full Stack Development?
Answer:
Python Full Stack Development involves using Python for backend development (e.g., Django, Flask) and combining it with frontend technologies (HTML, CSS, JavaScript, React, or Angular) to build complete web applications.
2. What are the key components of a Python Full Stack application?
Answer:
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Frontend: HTML, CSS, JavaScript, React, Angular
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Backend: Python with Django or Flask
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Database: PostgreSQL, MySQL, MongoDB
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Deployment: AWS, Docker, Heroku
3. What is the difference between Django and Flask?
FeatureDjangoFlask
TypeFull frameworkMicro-framework
Built-in FeaturesComes with authentication, ORM, admin panelMinimal, needs extensions
ScalabilitySuitable for large applicationsBetter for small apps
4. How does Django handle database queries?
Answer:
Django uses Object-Relational Mapping (ORM) to interact with databases.
Example:
python
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from myapp.models import User users = User.objects.filter(age__gte=18) # Fetch users above 18
5. How do you define a model in Django?
Answer:
python
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from django.db import models class Product(models.Model): name = models.CharField(max_length=100) price = models.FloatField() stock = models.IntegerField()
6. How does Flask handle routing?
Answer:
Flask uses the @app.route() decorator for routing.
Example:
python
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from flask import Flask app = Flask(__name__) @app.route('/hello') def hello(): return "Hello, Flask!"
7. What is the role of a template engine in Python Full Stack development?
Answer:
Template engines like Jinja2 (Flask) or Django Templates allow dynamic content rendering using HTML and Python variables.
8. How do you pass data from backend to frontend in Django?
Answer:
Using Django views:
python
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def home(request): context = {'name': 'John'} return render(request, 'home.html', context)
In home.html:
html
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<p>Hello, {{ name }}!</p>
9. What are Django migrations?
Answer:
Django migrations track database changes and apply them automatically.
bash
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python manage.py makemigrations python manage.py migrate
10. How do you connect a Python backend with a React frontend?
Answer:
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Use Django REST Framework (DRF) or Flask API to build a REST API.
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Connect React via Axios or Fetch API.
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Example API call in React:
javascript
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fetch("http://localhost:8000/api/products/") .then(response => response.json()) .then(data => console.log(data));
Intermediate Python Full Stack Questions (11-20)
11. What is REST API, and how is it implemented in Django?
Answer:
A REST API allows communication between frontend and backend using HTTP requests.
Example using Django REST Framework:
python
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from rest_framework.response import Response from rest_framework.decorators import api_view @api_view(['GET']) def get_data(request): return Response({'message': 'Hello from Django API'})
12. What is middleware in Django?
Answer:
Middleware is a way to process requests before they reach the view. Example:
python
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class CustomMiddleware: def __init__(self, get_response): self.get_response = get_response def __call__(self, request): print("Middleware executed") return self.get_response(request)
13. How do you handle authentication in Django?
Answer:
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Use Django’s built-in authentication system (django.contrib.auth).
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Implement JWT Authentication using djangorestframework-simplejwt.
14. What is the purpose of Flask’s blueprint?
Answer:
Blueprints help modularize large Flask applications:
python
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from flask import Blueprint auth = Blueprint('auth', __name__) @auth.route('/login') def login(): return "Login Page"
15. How do you optimize database queries in Django?
Answer:
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Use .select_related() and .prefetch_related() for fewer queries.
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Example:
python
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User.objects.select_related('profile').all()
16. What is WebSocket, and how do you implement it in Django?
Answer:
WebSockets allow real-time communication using Django Channels.
17. How do you manage environment variables in a Python Full Stack application?
Answer:
Use dotenv:
python
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import os from dotenv import load_dotenv load_dotenv() SECRET_KEY = os.getenv("SECRET_KEY")
18. How do you handle CORS issues in Flask?
Answer:
Use Flask-CORS:
python
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from flask_cors import CORS CORS(app)
19. How do you store static and media files in Django?
Answer:
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Store in STATICFILES_DIRS and MEDIA_ROOT.
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Use AWS S3 for production storage.
20. How do you deploy a Python Full Stack application?
Answer:
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Use Gunicorn + Nginx for Django deployment.
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Use Heroku or AWS EC2 for hosting.
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Example:
bash
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gunicorn --bind 0.0.0.0:8000 myproject.wsgi
Advanced Python Full Stack Questions (21-25)
21. What are Celery and Redis used for in Django?
Answer:
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Celery handles background tasks (e.g., sending emails).
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Redis acts as a message broker.
22. What is Docker, and how do you containerize a Python Full Stack app?
Answer:
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Use a Dockerfile:
dockerfile
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FROM python:3.8 WORKDIR /app COPY . . RUN pip install -r requirements.txt CMD ["gunicorn", "myapp.wsgi"]
23. How do you use GraphQL with Django?
Answer:
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Use graphene-django:
python
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import graphene class Query(graphene.ObjectType): hello = graphene.String(default_value="Hello, GraphQL!") schema = graphene.Schema(query=Query)
24. How do you scale a Python Full Stack application?
Answer:
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Use Load Balancing with Nginx.
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Use Database Replication for faster reads.
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Implement Caching (Redis, Memcached).
25. How do you write unit tests in Django?
Answer:
Use unittest:
python
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from django.test import TestCase class SimpleTest(TestCase): def test_addition(self): self.assertEqual(1 + 1, 2)
