♻️ Day 8: Reusability & Best Practices – Beginner’s Web Dev Series
Hi, I’m Shankar — a Sr. Software Engineer specializing in Python, Django, and DevOps. I build scalable web applications, APIs, and cloud-native systems, with a focus on clean architecture and backend automation.
Welcome to Day 8 of our Django journey!
By now, you’ve built working views, forms, authentication flows, and templates. Today, you’ll learn how to keep your code clean, reusable, and production-ready using the DRY principle, environment variables, and Git for version control.
📍 What You’ll Learn
The DRY Principle in Django (Don’t Repeat Yourself)
How to use reusable models, views, and templates
Why and how to use environment variables
How to set up Git and GitHub
Adding a
.gitignorefileCreating and using
.envand.env.example
🔁 1. The DRY Principle in Django
DRY = Don't Repeat Yourself
Reusability = Avoid writing the same thing multiple times.
✅ In Models
Instead of repeating timestamp fields in every model:
class BaseTimestampModel(models.Model):
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
abstract = True
Then reuse:
class Post(BaseTimestampModel):
title = models.CharField(max_length=200)
✅ In Templates
Use template inheritance:
<!-- base.html -->
<!DOCTYPE html>
<html>
<head>{% block head %}{% endblock %}</head>
<body>
{% block content %}{% endblock %}
</body>
</html>
<!-- home.html -->
{% extends 'base.html' %}
{% block content %}
<h1>Welcome!</h1>
{% endblock %}
🔐 2. Environment Variables
Don't hardcode secrets like this:
SECRET_KEY = 'abc123' ❌
Use a .env file:
# .env
SECRET_KEY=mysecretkey
DEBUG=True
Load it using python-decouple or django-environ.
Install:
pip install python-decouple
Update settings.py:
from decouple import config
SECRET_KEY = config('SECRET_KEY')
DEBUG = config('DEBUG', cast=bool)
🗂️ 3. Git & GitHub Setup
✅ Initialize Git
git init
git add .
git commit -m "Initial commit"
✅ Push to GitHub
gh repo create myproject --public
git push -u origin main
🛑 4. Add .gitignore
Create .gitignore in your root directory:
# .gitignore
*.pyc
__pycache__/
env/
venv/
db.sqlite3
*.env
/static/
/media/
✅ This prevents sensitive and unnecessary files from being tracked by Git.
📂 5. Create .env.example
# .env.example
DEBUG=True
SECRET_KEY=your-secret-key-here
✅ Helps teammates or future you understand what env vars are needed.
✅ Task for Day 8
Refactor a model using mixins (e.g., timestamps)
Setup a
.envfile usingpython-decoupleAdd
.gitignoreand push project to GitHubCreate a
.env.examplefile for sharing
🚀 Coming Up: Day 9 – REST API
In Day 9, we’ll cover:
Creating serializers
Creating API Views
Managing json payloads
