Start a Django project
To start a Django project you
must use the
django-admin executable or
django-admin.py script that comes with Django. After
you install Django, both this executable and script should be
accessible from any directory on your system (e.g. installed under
/usr/local/bin/ or the
/bin/ directory of a virtualenv). Note that both the
executable and script offer the same functionality, therefore I
will use the
django-admin term interchangeably going
offers various subcommands you'll use extensively for your daily
work with Django projects. But it's the
subcommand you'll use first, since it creates the initial structure
of a Django project. The
receives a single argument to indicate the name of project, as
illustrated in the following snippet.
#Create a project called coffeehouse django-admin startproject coffeehouse #Create a project called sportstats django-admin startproject sportstats
A Django project name can be composed of numbers, letters or underscores. A project name cannot start with a number, it can only start with a letter or underscore. In addition, special characters and spaces are not allowed anywhere in a project name, mainly because Django project names serve as a naming convention for directories and Python packages.
startproject <project_name>, a directory called
<project_name> is created containing the default
Django project structure. The default Django project structure is
illustrated in listing 1-11.
Listing 1-11. Django project structure
+<BASE_DIR_project_name> | +----manage.py | +---+-<PROJECT_DIR_project_name> | +-__init__.py +-settings.py +-urls.py +-wsgi.py
If you inspect the directory
layout, you'll notice there are two directories with the
<project_name> value. I will refer to the top
level Django project directory as
manage.py file and the other
sub-directory based on the project name. And I will refer to the
second level sub-directory -- which includes the
wsgi.py files -- as
PROJECT_DIR. Next, I'll describe the purpose of each
file in listing 1-11.
manage.py.- Runs project specific tasks. Just as
django-adminis used to execute system wide Django tasks,
manage.pyis used to execute project specific tasks.
__init__.py.- Python file that allows Python packages to be imported from directories where it's present. Note
__init__.pyis not Django specific, it's a generic file used in almost all Python applications.
settings.py.- Contains the configuration settings for the Django project.
urls.py.- Contains URL patterns for the Django project.
wsgi.py.- Contains WSGI configuration properties for the Django project. WSGI is the recommended approach to deploy Django applications on production (i.e. to the public). You don't need to setup WSGI to develop Django applications.
Tip Rename a project's
BASE_DIR. Having two nested directories with the same name in a Django project can lead to confusion, especially if you deal with Python package import issues. To save yourself trouble, I recommend you rename the
BASE_DIRto something different than the project name (e.g. rename, capitalize or shorten the name to make it different than the
Caution Do not rename the
PROJECT_DIRname is hard-coded into some project files (e.g.
wsgi.py) so do not change its name. If you need to rename the
PROJECT_DIRit's simpler to create another project with a new name.
Now that you're familiar with the
default Django project structure, let's see the default Django
project in a browser. All Django projects have a built-in web
server to observe an application in a browser as changes are made
to project files. Placed in the
BASE_DIR of a Django
project -- where the
manage.py file is -- run the
python manage.py runserver as shown in listing
Listing 1-12. Start Django development web server provided by manage.py
[user@coffeehouse ~]$ python manage.py runserver Performing system checks... System check identified no issues (0 silenced). You have 13 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions. Run 'python manage.py migrate' to apply them. May 23, 2017 - 22:41:20 Django version 1.11, using settings 'coffeehouse.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CONTROL-C.
As illustrated in listing 1-12,
python manage.py runserver starts a
development web server on http://127.0.0.1:8000/ -- which
is the local address on your system. Don't worry about the
'unapplied migration(s)' message for the moment, I'll
address it in the upcoming section on setting up a database for a
Django project. Next, if you open a browser and point it to the
address http://127.0.0.1:8000/ you should see the default
home page for a Django project illustrated in figure 1-3.
Figure 1-3. Default home page for a Django project
Sometimes it's convenient to
alter the default address and port for Django's development web
server. This can be due to the default port being busy by another
service or the need to bind the web server to a non-local address
so someone on a remote machine can view the development server.
This is easily achieved by appending either the port or full
address:port string to the
python manage.py runserver
command, as shown in the various examples in listing 1-13.
Listing 1-13. Start Django development web server on different address and port
# Run the development server on the local address and port 4345 (http://127.0.0.1:4345/) python manage.py runserver 4345 # Run the dev server on the 188.8.131.52 address and port 80 (http://184.108.40.206/) python manage.py runserver 220.127.116.11:80 # Run the dev server on the 192.168.0.2 address and port 8888 (http://192.168.0.2:8888/) python manage.py runserver 192.168.0.2:8888