Python Tutorials

Python - Django

Python - Django

Django 

Introduction

Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It was developed by experienced developers to take care of much of the hassle of web development, so developers can focus on writing their apps without needing to reinvent the wheel. Django is free, open source, and actively maintained by a large community. It emphasizes reusability, less code, and the principle of "Don't Repeat Yourself" (DRY).

In this comprehensive guide, we’ll explore the foundational aspects of Django, including its architecture, configuration, app creation, URL routing, views, templates, models, forms, admin interface, middleware, security, and deployment strategies.

Getting Started with Django

Installing Django


pip install django

Check the Installed Version


django-admin --version

Creating a Django Project

To begin building with Django, you need to create a project. A project is a collection of settings and configurations for an instance of Django, including database connection info, apps you want to enable, middleware, etc.

Creating a Project


django-admin startproject myproject
cd myproject
python manage.py runserver

Visit http://127.0.0.1:8000/ to see the default welcome page.

Project Structure


myproject/
├── manage.py
└── myproject/
    ├── __init__.py
    ├── settings.py
    ├── urls.py
    ├── asgi.py
    └── wsgi.py

Creating a Django App

In Django, a project is composed of one or more apps. An app is a self-contained component that performs specific functionalities such as a blog, a user system, or a forum.

Create a New App


python manage.py startapp blog

Register the App


# settings.py

INSTALLED_APPS = [
    ...
    'blog',
]

Creating Views

Basic View Function


# blog/views.py

from django.http import HttpResponse

def home(request):
    return HttpResponse("Hello, Django World!")

Configuring URLs

App URLs


# blog/urls.py

from django.urls import path
from . import views

urlpatterns = [
    path('', views.home, name='home'),
]

Project URLs


# myproject/urls.py

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('blog.urls')),
]

Using Templates

Django uses its own templating engine to render HTML. Templates allow passing data from views to frontend.

Create a Template


# blog/templates/blog/home.html

<!DOCTYPE html>
<html>
<head><title>Home</title></head>
<body>
    <h1>Hello {{ name }}!</h1>
</body>
</html>

Render Template from View


# blog/views.py

from django.shortcuts import render

def home(request):
    return render(request, 'blog/home.html', {'name': 'Django'})

Models and Databases

Django uses ORM (Object Relational Mapper) to define models which map to database tables.

Create a Model


# blog/models.py

from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.title

Migrate Database


python manage.py makemigrations
python manage.py migrate

Admin Interface

Django comes with a powerful built-in admin interface.

Create a Superuser


python manage.py createsuperuser

Register Model with Admin


# blog/admin.py

from django.contrib import admin
from .models import Post

admin.site.register(Post)

Working with Forms

Using Django Forms


# blog/forms.py

from django import forms

class PostForm(forms.Form):
    title = forms.CharField(max_length=200)
    content = forms.CharField(widget=forms.Textarea)

Form View


# blog/views.py

from .forms import PostForm

def create_post(request):
    if request.method == 'POST':
        form = PostForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data)
    else:
        form = PostForm()
    return render(request, 'blog/create_post.html', {'form': form})

Class-Based Views

Simple Class View


from django.views import View
from django.http import HttpResponse

class HelloView(View):
    def get(self, request):
        return HttpResponse('Hello from CBV!')

Static Files

Settings for Static Files


STATIC_URL = '/static/'
STATICFILES_DIRS = [BASE_DIR / "static"]

Media Files

Settings for Media Files


MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

User Authentication

Registering Users


from django.contrib.auth.models import User

user = User.objects.create_user(username='john', password='mypassword')

Login Required


from django.contrib.auth.decorators import login_required

@login_required
def dashboard(request):
    return render(request, 'blog/dashboard.html')

Middlewares

Custom Middleware


# blog/middleware.py

class SimpleMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        print("Middleware executed")
        response = self.get_response(request)
        return response

Django REST Framework

Install DRF


pip install djangorestframework

Simple API View


from rest_framework.decorators import api_view
from rest_framework.response import Response

@api_view(['GET'])
def api_home(request):
    return Response({"message": "Hello API"})

Testing

Writing Tests


from django.test import TestCase
from .models import Post

class PostTestCase(TestCase):
    def test_post_creation(self):
        post = Post.objects.create(title="Test", content="Test content")
        self.assertEqual(post.title, "Test")

Deployment

Production Setup with Gunicorn


pip install gunicorn
gunicorn myproject.wsgi

Collect Static Files


python manage.py collectstatic

Django provides a powerful, fully featured framework for developing secure, scalable web applications with Python. From its admin interface to its ORM and robust templating system, Django allows developers to focus on building their applications without worrying about reinventing core web features.

This guide introduced core Django concepts including projects and apps, views, models, templates, forms, authentication, and deployment. With practice, developers can build anything from simple blogs to enterprise-grade systems using Django’s extensive ecosystem.

Django’s philosophy of "batteries included" gives it a rich set of tools, but it remains highly customizable and extendable, making it one of the top choices for web development with Python.

logo

Python

Beginner 5 Hours
Python - Django

Django 

Introduction

Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. It was developed by experienced developers to take care of much of the hassle of web development, so developers can focus on writing their apps without needing to reinvent the wheel. Django is free, open source, and actively maintained by a large community. It emphasizes reusability, less code, and the principle of "Don't Repeat Yourself" (DRY).

In this comprehensive guide, we’ll explore the foundational aspects of Django, including its architecture, configuration, app creation, URL routing, views, templates, models, forms, admin interface, middleware, security, and deployment strategies.

Getting Started with Django

Installing Django


pip install django

Check the Installed Version


django-admin --version

Creating a Django Project

To begin building with Django, you need to create a project. A project is a collection of settings and configurations for an instance of Django, including database connection info, apps you want to enable, middleware, etc.

Creating a Project


django-admin startproject myproject
cd myproject
python manage.py runserver

Visit http://127.0.0.1:8000/ to see the default welcome page.

Project Structure


myproject/
├── manage.py
└── myproject/
    ├── __init__.py
    ├── settings.py
    ├── urls.py
    ├── asgi.py
    └── wsgi.py

Creating a Django App

In Django, a project is composed of one or more apps. An app is a self-contained component that performs specific functionalities such as a blog, a user system, or a forum.

Create a New App


python manage.py startapp blog

Register the App


# settings.py

INSTALLED_APPS = [
    ...
    'blog',
]

Creating Views

Basic View Function


# blog/views.py

from django.http import HttpResponse

def home(request):
    return HttpResponse("Hello, Django World!")

Configuring URLs

App URLs


# blog/urls.py

from django.urls import path
from . import views

urlpatterns = [
    path('', views.home, name='home'),
]

Project URLs


# myproject/urls.py

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('blog.urls')),
]

Using Templates

Django uses its own templating engine to render HTML. Templates allow passing data from views to frontend.

Create a Template


# blog/templates/blog/home.html

<!DOCTYPE html>
<html>
<head><title>Home</title></head>
<body>
    <h1>Hello {{ name }}!</h1>
</body>
</html>

Render Template from View


# blog/views.py

from django.shortcuts import render

def home(request):
    return render(request, 'blog/home.html', {'name': 'Django'})

Models and Databases

Django uses ORM (Object Relational Mapper) to define models which map to database tables.

Create a Model


# blog/models.py

from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=200)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.title

Migrate Database


python manage.py makemigrations
python manage.py migrate

Admin Interface

Django comes with a powerful built-in admin interface.

Create a Superuser


python manage.py createsuperuser

Register Model with Admin


# blog/admin.py

from django.contrib import admin
from .models import Post

admin.site.register(Post)

Working with Forms

Using Django Forms


# blog/forms.py

from django import forms

class PostForm(forms.Form):
    title = forms.CharField(max_length=200)
    content = forms.CharField(widget=forms.Textarea)

Form View


# blog/views.py

from .forms import PostForm

def create_post(request):
    if request.method == 'POST':
        form = PostForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data)
    else:
        form = PostForm()
    return render(request, 'blog/create_post.html', {'form': form})

Class-Based Views

Simple Class View


from django.views import View
from django.http import HttpResponse

class HelloView(View):
    def get(self, request):
        return HttpResponse('Hello from CBV!')

Static Files

Settings for Static Files


STATIC_URL = '/static/'
STATICFILES_DIRS = [BASE_DIR / "static"]

Media Files

Settings for Media Files


MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

User Authentication

Registering Users


from django.contrib.auth.models import User

user = User.objects.create_user(username='john', password='mypassword')

Login Required


from django.contrib.auth.decorators import login_required

@login_required
def dashboard(request):
    return render(request, 'blog/dashboard.html')

Middlewares

Custom Middleware


# blog/middleware.py

class SimpleMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        print("Middleware executed")
        response = self.get_response(request)
        return response

Django REST Framework

Install DRF


pip install djangorestframework

Simple API View


from rest_framework.decorators import api_view
from rest_framework.response import Response

@api_view(['GET'])
def api_home(request):
    return Response({"message": "Hello API"})

Testing

Writing Tests


from django.test import TestCase
from .models import Post

class PostTestCase(TestCase):
    def test_post_creation(self):
        post = Post.objects.create(title="Test", content="Test content")
        self.assertEqual(post.title, "Test")

Deployment

Production Setup with Gunicorn


pip install gunicorn
gunicorn myproject.wsgi

Collect Static Files


python manage.py collectstatic

Django provides a powerful, fully featured framework for developing secure, scalable web applications with Python. From its admin interface to its ORM and robust templating system, Django allows developers to focus on building their applications without worrying about reinventing core web features.

This guide introduced core Django concepts including projects and apps, views, models, templates, forms, authentication, and deployment. With practice, developers can build anything from simple blogs to enterprise-grade systems using Django’s extensive ecosystem.

Django’s philosophy of "batteries included" gives it a rich set of tools, but it remains highly customizable and extendable, making it one of the top choices for web development with Python.

Related Tutorials

Frequently Asked Questions for Python

Python is commonly used for developing websites and software, task automation, data analysis, and data visualisation. Since it's relatively easy to learn, Python has been adopted by many non-programmers, such as accountants and scientists, for a variety of everyday tasks, like organising finances.


Python's syntax is a lot closer to English and so it is easier to read and write, making it the simplest type of code to learn how to write and develop with. The readability of C++ code is weak in comparison and it is known as being a language that is a lot harder to get to grips with.

Learning Curve: Python is generally considered easier to learn for beginners due to its simplicity, while Java is more complex but provides a deeper understanding of how programming works. Performance: Java has a higher performance than Python due to its static typing and optimization by the Java Virtual Machine (JVM).

Python can be considered beginner-friendly, as it is a programming language that prioritizes readability, making it easier to understand and use. Its syntax has similarities with the English language, making it easy for novice programmers to leap into the world of development.

To start coding in Python, you need to install Python and set up your development environment. You can download Python from the official website, use Anaconda Python, or start with DataLab to get started with Python in your browser.

Learning Curve: Python is generally considered easier to learn for beginners due to its simplicity, while Java is more complex but provides a deeper understanding of how programming works.

Python alone isn't going to get you a job unless you are extremely good at it. Not that you shouldn't learn it: it's a great skill to have since python can pretty much do anything and coding it is fast and easy. It's also a great first programming language according to lots of programmers.

The point is that Java is more complicated to learn than Python. It doesn't matter the order. You will have to do some things in Java that you don't in Python. The general programming skills you learn from using either language will transfer to another.


Read on for tips on how to maximize your learning. In general, it takes around two to six months to learn the fundamentals of Python. But you can learn enough to write your first short program in a matter of minutes. Developing mastery of Python's vast array of libraries can take months or years.


6 Top Tips for Learning Python

  • Choose Your Focus. Python is a versatile language with a wide range of applications, from web development and data analysis to machine learning and artificial intelligence.
  • Practice regularly.
  • Work on real projects.
  • Join a community.
  • Don't rush.
  • Keep iterating.

The following is a step-by-step guide for beginners interested in learning Python using Windows.

  • Set up your development environment.
  • Install Python.
  • Install Visual Studio Code.
  • Install Git (optional)
  • Hello World tutorial for some Python basics.
  • Hello World tutorial for using Python with VS Code.

Best YouTube Channels to Learn Python

  • Corey Schafer.
  • sentdex.
  • Real Python.
  • Clever Programmer.
  • CS Dojo (YK)
  • Programming with Mosh.
  • Tech With Tim.
  • Traversy Media.

Python can be written on any computer or device that has a Python interpreter installed, including desktop computers, servers, tablets, and even smartphones. However, a laptop or desktop computer is often the most convenient and efficient option for coding due to its larger screen, keyboard, and mouse.

Write your first Python programStart by writing a simple Python program, such as a classic "Hello, World!" script. This process will help you understand the syntax and structure of Python code.

  • Google's Python Class.
  • Microsoft's Introduction to Python Course.
  • Introduction to Python Programming by Udemy.
  • Learn Python - Full Course for Beginners by freeCodeCamp.
  • Learn Python 3 From Scratch by Educative.
  • Python for Everybody by Coursera.
  • Learn Python 2 by Codecademy.

  • Understand why you're learning Python. Firstly, it's important to figure out your motivations for wanting to learn Python.
  • Get started with the Python basics.
  • Master intermediate Python concepts.
  • Learn by doing.
  • Build a portfolio of projects.
  • Keep challenging yourself.

Top 5 Python Certifications - Best of 2024
  • PCEP (Certified Entry-level Python Programmer)
  • PCAP (Certified Associate in Python Programmer)
  • PCPP1 & PCPP2 (Certified Professional in Python Programming 1 & 2)
  • Certified Expert in Python Programming (CEPP)
  • Introduction to Programming Using Python by Microsoft.

The average salary for Python Developer is ₹5,55,000 per year in the India. The average additional cash compensation for a Python Developer is within a range from ₹3,000 - ₹1,20,000.

The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python website, https://www.python.org/, and may be freely distributed.

If you're looking for a lucrative and in-demand career path, you can't go wrong with Python. As one of the fastest-growing programming languages in the world, Python is an essential tool for businesses of all sizes and industries. Python is one of the most popular programming languages in the world today.

line

Mail us :

Address :

India
  • Facebook_logo
  • Instagram_logo
  • Linkedin_logo
  • X-twitter_logo
  • Youtube_logo
  • Pinterest_logo

Sub Categories

Copyrights © 2024 letsupdateskills All rights reserved