Django On Jython (for Portland and Boulder Python user groups presentations)

Django on Jython
Leo Soto

Not exactly “ Summer of Code” but...
...worked incredibly well!
And that's why I'm here :)

Why Django on Jython ?
Integration
Deployment
Performance

Jython

Jython
Implementation of Python
Compiles to Java bytecode
No foo.pyc
It's foo$py.class

Jython
Makes Java look like Python
And Python like Java to Java programs
No GIL, no ref counting

>>> from __future__ import GIL Traceback (most recent call last): ... SyntaxError: Never going to happen! (<stdin>, line 1)

State of Jython 2.5
99.4% of ~5700 test cases passing
~20% faster on PyStone [FWIW]
2.5 alpha 2 last weekend for DjangoCon
September/October beta
December/January final

Java - What We Like
Great systems programming language
Well-defined memory, concurrency model
Standard libraries - concurrent collections

Java Ecosystem
Excel, thru Apache POI support of OLE
Full text search with Lucene
Scalability with Hadoop, Hbase
Scala, JRuby, Rhino...

Biggest Benefit
Just use what is good out there in the Java ecosystem

Now...

Why in the name of...
J2EE was a big, horrible mistake
But lessons have been learned
And it’s possible to use that infrastructure

“We write Java so you don’t have to.”

Combination
In Python code:
Django app framework
Models, templates, forms
Business logic - as complex as necessary
In Java code (optional)
Performant infrastructure

Deployment Options
Java App Servers!

modjy
Servlets <=> WSGI

WAR!
Web ARchive format
Standard deployment of Java webapps
Just a zip file with a standard directory layout

A Django WAR:
jython manage.py war --include-java-libs=XXX.jar

What’s missing
PIL! so no Photolog
Oracle, MySQL, SQLServer backends
But that’s easy
zxJDBC: JDBC <=> DB-API

Django Backend Dev
Features
Operations
Client
Creation and Introspection
Validation
Wrapper

Thanks!

http://charlas.continuum.cl	25
http://www.slideshare.net	9
http://www.linkedin.com	3

Django On Jython (for Portland and Boulder Python user groups presentations)

by Leonardo Soto on Sep 25, 2008

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