This document discusses configuring Python and the Web Server Gateway Interface (WSGI) on an Apache web server. It explains that Python is an interpreted programming language that supports multiple paradigms like object-oriented and functional programming. WSGI defines a universal interface between web servers and web applications to promote portable development. The steps shown configure Apache to use the WSGI module by installing it, enabling the module, associating the .wsgi extension, and restarting Apache. It demonstrates creating a basic "Hello World" WSGI application that returns a plain text response.

1. Configure Python + WSGI
Sitthykun LY
@sitthykun
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2. We will talk
● What is Python Language??
● How to set up Python??
● How to run??
● What is WSGI??
● How to set up WSGI??
● How to run??

3. What is Python Language??
● Python is an interpreted, general-purpose high-level programming
language whose design philosophy emphasizes code readability. Python
aims to combine "remarkable power with very clear syntax", and its
standard library is large and comprehensive. Its use of indentation for
block delimiters is unique among popular programming languages.
●
● Python supports multiple programming paradigms, primarily but not
limited to object oriented, imperative and, to a lesser extent, functional
programming styles. It features a fully dynamic type system and
automatic memory management, similar to that of Scheme, Ruby, Perl,
and Tcl. Like other dynamic languages, Python is often used as a
scripting language, but is also used in a wide range of non-scripting
contexts.
● http://en.wikipedia.org/wiki/Python_language
●

4. What is WSGI??
● The Web Server Gateway Interface (WSGI) defines
a simple and universal interface between web
servers and web applications or frameworks for the
Python
● WSGI(sometimes pronounced like 'whiskey' or 'wiz-
gee') was created as a low-level interface between
web servers and web applications or frameworks to
promote common ground for portable web
application development. WSGI is based on the
existing CGI standard.
● http://en.wikipedia.org/wiki/Wsgi

5. How to set up WSGI??
● Assuming you have Apache2, installed, you'll
need to install the WSGI module:
● sudo apt-get install libapache2-mod-wsgi
● This should install the module. Now to activate
it:
● sudo a2enmod mod-wsgi
● Now to restart Apache2:
● sudo /etc/init.d/apache2 restart

6. How to set up WSGI??
● Okay, we have the module installed and ready
to go, but now we need to associate the module
with the ".wsgi" extension on your server. This
will make files with a .wsgi extension use the
wsgi module for processing. Open up
/etc/apache2/sites-available/default:
● sudo gedit /etc/apache2/sites-available/default

7. How to set up WSGI??
● Around line 10, you should have something like
this:
● <Directory /var/www/>
● Options Indexes FollowSymLinks MultiViews
ExecCGI
● AllowOverride None
● Order allow,deny
● allow from all
● </Directory>

8. How to set up WSGI??
● Replace it with this:
● <Directory /var/www/>
● Options Indexes FollowSymLinks MultiViews ExecCGI
●
● AddHandler cgi-script .cgi
● AddHandler wsgi-script .wsgi
●
● AllowOverride None
● Order allow,deny
● allow from all
● </Directory>

9. How to set up WSGI??
● If you don't want to replace the whole thing, all
you need to do is add "ExecCGI" to the Options
list, and add the handlers cgi-script and wsgi-
script (shown above).
● That's it. Restart Apache:
● sudo /etc/init.d/apache2 restart

10. How to set up WSGI??
● You're done!
● If you want to make "index.wsgi" act as an index
for your directory (much like index.htm,
index.html, index.php), open up
/etc/apache2/mods-enabled/dir.conf:
● sudo gedit /etc/apache2/mods-enabled/dir.conf
● And change line (the line that has the
DirectoryIndex) to:
● DirectoryIndex index.html index.cgi index.pl
index.php index.xhtml index.htm index.wsgi

11. How to set up run WSGI??
● Create index.wsgi:
● def application(environ, start_response):
● status = '200 OK'
● output = 'Hello World!'
●
● response_headers = [('Content-type', 'text/plain'),
● ('Content-Length', str(len(output)))]
● start_response(status, response_headers)
●
● return [output]
● Go to http://localhost/index.wsgi