NOTE: This article was rewritten (for CentOS 6.4). please read the updated post.

What is Python?

“Python is a general-purpose, high-level programming language whose design philosophy emphasizes code readability. Its syntax is said to be clear and expressive.” from Wikipedia.

Visit http://www.python.org/

What is Django?

“Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.” from https://www.djangoproject.com/

Installing Python

Prerequisites

you may need the EPEL repositories for Centos.

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cd /opt/
wget http://mirrors.nl.eu.kernel.org/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uvh epel-release-6-8.noarch.rpm
rm epel-release-6-8.noarch.rpm -f

cd /opt/
wget http://mirrors.nl.eu.kernel.org/fedora-epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uvh epel-release-6-8.noarch.rpm
rm epel-release-6-8.noarch.rpm -f

Installation Process

Simple as:

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yum install python

yum install python

test python by typing: “python” and you should see something similar to:

As for this time being of writing (June 18 2012), the version of python@EPEL is 2.6.6

Django works with any Python version from 2.6.5 to 2.7. It also features experimental support for versions 3.2 and 3.3. All these versions of Python include a lightweight database called SQLite so you won’t need to set up a database just yet unless you need other SQL

Installing SQL

If you need other SQL Server else then SQLite,  you can follow:
MySQL/MongoDB/CouchDB on RHEL/Centos 6.3
If you don’t need SQL and you installed Python 2.5 or later, you can skip this step for now.

Installing Django

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yum install Django

yum install Django

Testing Django

Test Django by typing python on your command and then:

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import django
print django.get_version()

import django
print django.get_version()

As you can see, the RPM version is version 1.3.1, while the current release version is 1.4.1. while you are not too far behind using EPEL, you won’t get to play with the last options. Internationalization: in template code is not available in 1.3.1 for example but only from Django 1.4

Creating Project

From the command, cd into a directory where you’d like to store your app, then run the following command:

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django-admin startproject mysite
cd mysite

django-admin startproject mysite
cd mysite

Starting Server

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python manage.py runserver

python manage.py runserver

You’ve started the Django development server, a lightweight Web server – easier to startwithout having to deal with configuring a production server — such as Apache — until you’re ready for production.

Browse to http://127.0.0.1:8000/ with your Web browser. You’ll see a “Welcome to Django” page. It worked!

To change port:

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python manage.py runserver 8080

python manage.py runserver 8080

If you need to start the server to answer not only locally, use:

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python manage.py runserver 0.0.0.0:8000

python manage.py runserver 0.0.0.0:8000

Configure more…

Config Database

Edit mysite/settings.py. It’s a normal Python module with module-level variables representing Django settings.

Help here.

Django using Apache

To run your Django application inside apache – use either mod_python or mod_wsgi, Support for mod_python will be deprecated in a future release of Django. If you are configuring a new deployment, you are strongly encouraged to consider using mod_wsgi or any of the other supported backends.

Install mod_python

For this to work, you must have apache installed and configured.

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yum install mod_python

yum install mod_python

python using mod_python

you need to configure you apache/VirtualHost to:

    AddHandler mod_python .py
    PythonHandler mod_python.publisher | .py
    AddHandler mod_python .psp .psp_
    PythonHandler mod_python.psp | .psp .psp_
    PythonDebug On</pre>
[/code]

 
<h3>Testing mod_python</h3>
Create a '<em>test.py'</em> file in your apache server. put inside:
[code lang="py"]<% req.write("Hello World!") %>[/code]

and browse to www.your.server/test.py and you should see the "Hello World!" there.
<h3>Django using mod_python</h3>
Edit your <tt>httpd.conf</tt> file:

[code lang="apache"]
<pre><Location "/mysite/">
    SetHandler python-program
    PythonHandler django.core.handlers.modpython
    SetEnv DJANGO_SETTINGS_MODULE mysite.settings
    PythonOption django.root /mysite
    PythonDebug On
</Location>

read more…

Install mod_wsgi

Deploying Django with Apache and mod_wsgi is the recommended way to get Django into production.

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yum install mod_wsgi

yum install mod_wsgi

to use mod_wsgi, create an apache folder inside your project and create a django.wsgi file:

import os, sys
sys.path.append('/var/www/django')
sys.path.append('/var/www/django/mysite')
os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings'

application = django.core.handlers.wsgi.WSGIHandler()

and configure your apache with:

<VirtualHost *:80>

<Directory /var/www/django/mysite/static>
Order deny,allow
Allow from all
</Directory>
</VirtualHost>

read more on: multiple django sites with apache & mod_wsgi

That’s it!

You’ve Python / Django installed on your Centos 6.3 and a new project template waiting for you to work on.

Continue reading…

• Django URL dispatcher routing beginners tutorial
• Django documentation
• WSGI Reloading Source Code – If you find the server reload is frasturating.

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Etay Cohen-Solal

Development Specialist, Artist and Activist
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