? Creating and Adding Django Apps

? Quick Overview

In Django, a project can consist of multiple apps, each of which handles a specific aspect of the project’s functionality. Apps are modular, allowing you to organize your project into reusable components.

? Key Concepts

• Django apps are reusable modules inside a project
• Each app focuses on a single responsibility
• Apps must be registered in INSTALLED_APPS

? Syntax / Theory

Django provides the startapp command to generate the default app structure with essential files like models, views, and admin configuration.

? Step 1: Create a New Django App

# Create a new app called 'myapp'
python manage.py startapp myapp

? Generated App Structure

# Default files created inside the app
myapp/
__init__.py
admin.py
apps.py
models.py
tests.py
views.py

? Step 2: App Directory Explanation

• __init__.py – Marks the folder as a Python package
• admin.py – Register models for admin panel
• apps.py – App configuration file
• models.py – Database models
• tests.py – Unit tests
• views.py – Business logic

? Step 3: Add App to settings.py

# Register app inside INSTALLED_APPS
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'myapp',
]

? Step 4: Run Development Server

# Start Django development server
python manage.py runserver

? Interactive Flow (Conceptual)

Project ➜ App ➜ Models ➜ Views ➜ URLs ➜ Browser

? Use Cases

• User authentication module
• Blog system
• E-commerce product module