Learn the Django framework from scratch: practical tutorials and examples

Learn Django Framework from Scratch: Practical Tutorials and Examples

Django is a popular Python web application framework that simplifies the website development process. It provides a powerful set of tools and libraries to help developers build efficient, scalable and secure web applications. For beginners, learning Django may be difficult, but through some practical tutorials and examples, you can quickly get started and understand the core concepts and usage of this framework.

This article will take you step by step to learn the Django framework and provide some specific code examples, allowing you to build a simple web application from scratch.

First, you need to install Python and Django. Make sure you have installed Python correctly and enter the following command at the command line to install Django:

pip install django

Next, we will create a new Django project. Enter the following command at the command line:

django-admin startproject mysite

This will create a new project named "mysite". Go into the project folder and run the following command to start the development server:

cd mysite
python manage.py runserver

Now you can open "http://localhost:8000" in your browser to view your application.

Next, we will create a simple application. Run the following command in the command line:

python manage.py startapp myapp

This will create a new application named "myapp". To make our app known to Django, open the "settings.py" file in the project folder and add "myapp" to the "INSTALLED_APPS" list.

Now, we will create a simple view. In the application's folder, open the "views.py" file and add the following code:

from django.http import HttpResponse

def hello(request):
    return HttpResponse("Hello, world!")

Next, we need to create a URL mapping in order to send requests to our view functions. In the application's folder, create a new file called "urls.py" and add the following code:

from django.urls import path

from . import views

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

Now, we need to add this URL mapping to the project's "urls.py" in the file. In the project's folder, open the "urls.py" file and add the following code:

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

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

Now you can restart the development server and open "http://localhost:8000/" in your browser hello" to view your application.

In addition to simple views, Django also provides powerful model and database interaction functions. We can create a simple model to store and retrieve data. In the application's folder, open the "models.py" file and add the following code:

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=200)

    def __str__(self):
        return self.title

Next, we need to create a table for this model in the database. Run the following command on the command line:

python manage.py makemigrations
python manage.py migrate

Now, we can add, edit, and delete book records through Django's admin interface. In order to enable the admin interface, we need to create a new file called "admin.py" in the application's folder and add the following code:

from django.contrib import admin

from .models import Book

admin.site.register(Book)

Now we can restart the development server and access " http://localhost:8000/admin" to log in to the administrator account and manage book records.

Through the above practical tutorials and examples, you have already understood the basic usage and core concepts of the Django framework. You can continue to learn advanced features such as Django's template system, forms, and authentication capabilities to build more complex web applications.

Hope this tutorial will be helpful to your Django learning journey! I wish you success!

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