Samuli Natri - Django - The Easy Way (3rd Edition)
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This book is for sale at http://leanpub.com/django-the-easy-way
This version was published on 2020-03-14
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This is a Leanpub book. Leanpub empowers authors and publishers with the Lean Publishing process. Lean Publishing is the act of publishing an in-progress ebook using lightweight tools and many iterations to get reader feedback, pivot until you have the right book and build traction once you do.
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Samuli Natri is a software developer. He studied computer science at Helsinki University of Technology.
Python is a general-purpose programming language that is used in wide range of domains, including scientific computing, artificial intelligence and web development.
Django is a Python-based web framework that allows you to build dynamic, database-driven applications without having to re-invent the wheel. It provides a lot of features out-of-the-box like database abstraction layer and templating engine. Instagram, Bitbucket and Disqus uses Django.
This book is intended for anyone who is interested in learning the Django web framework key features in a practical, step-by-step manner. You are not required to have any previous experience with web development or programming languages to be able to follow along.
This book introduces the reader to all essential Django web development concepts, such as views, models, databases, templates, forms, authentication, deployment, APIs and testing.
The complete source code can be found in GitHub: http://bit.ly/38A12sff. Feel free to send feedback at contact@samulinatri.com.
Visit http://www.python.org and install Python. Check Add Python x to PATH if you are using the Windows installer.
Search for Terminal or Command Prompt to find a terminal program and open it up.
Run the following command:
Command PromptYou might need to use py
or python
on your system. This puts the Python interpreter in interactive mode:
Make sure you are running Python version 3.
Python interpreter is a program that translates source code into intermediate representation and immediately executes it.
In the interactive prompt we can type and run Python code directly without creating a .py
file:
This chapter covers
- Creating virtual environments
- Installing Django
- Creating a new Django project
With virtual environments each project can have its own unique set of dependencies. You can work on multiple projects simultaneously without them interfering with each other.
Use these commands to create and activate a virtual environment in Unix-like systems:
Command PromptUse these commands in Windows:
Command PromptYou can create the virtual environment directory anywhere in your system. In this case we use the .virtualenvs
directory inside the users home directory.
The (mysite) prefix indicates that the environment is active:
Command Promptdeactivate
command deactivates the environment.
Check out virtualenvwrapper and pyenv if you are looking for more comprehensive tools for virtual environment and Python version management.
Django is installed like any other Python package:
Command PromptThis will install Django inside the virtual environment directory we just created (~/.virtualenvs/mysite
). Pip is a Python package manager.
Create a new Django project:
Command Promptdjango-admin
is a command line tool for administrative tasks.- The
startproject
command creates the Django project directory structure.mysite
is the name of the project. Use.
(dot) to create the project in the current directory.
You should now have this kind of directory structure:
Command PromptYou have to tell Django which settings youre using by defining an environment variable named DJANGO_SETTINGS_MODULE
. manage.py
works like the django-admin
utility but it also conveniently points the DJANGO_SETTINGS_MODULE
system variable to the project settings.py
file.
We use the term project to describe a Django web application. The mysite
subdirectory inside the main mysite
directory is the project Python package. Inside it we have the project settings, URL declarations and WSGI configuration. The __init__.py
file makes this directory a Python package.
WSGI is a standard that defines how applications and servers communicate with each other.
Django provides a built-in development server. Run the following command to start it:
Command PromptThe You have x unapplied migration(s) warning is related to database migrations. You can ignore it for now.
Visit http://127.0.0.1:8000
with a browser and you should see the welcome screen:
Use the built-in server only for development purposes. There are better options for production environments (like Nginx and Gunicorn).
We use virtual environments to manage project dependencies. Pip package manager makes it easy to install Python packages (like Django). The django-admin startproject mysite .
command creates a Django directory structure. Django comes with a lightweight web server that you can use when building the website.
This chapter covers
- Adding features with apps
- Configuring URLs
- Creating views
- Creating templates
App is a Python package that usually contains models, views, URLs, templates and other files needed to implement some set of features. Lets start by adding a blogging app that allows us to write and publish blog posts.
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