Django on Jython Jim Baker Leo Soto

Jim Baker

Leo Soto

Jython Status

Shipped 2.5 (beta3)

Greatly improved “compatibility”

setuptools

virtualenv

nose

etree

web 2 py

Django + Jython: Why?

Installing this Django app...

...in an Enterprise Infrastructure

(I mean, this kind of enterprise infrastructure)

Didn't work quite well

Guess how much time it took

We like Python They need Java

Jython

Avoiding Java Sneaking Python Is that it?

No, it is more than that! (if you want)

Examples...

Python/Django Install Django Install 3rd party deps Install app(s) Tweak settings.py Configure web server Make sure everything is consistent Steps to Deploy a Web Application

Python/Django

Install Django

Install 3rd party deps

Install app(s)

Tweak settings.py

Configure web server

Make sure everything is consistent

Java Copy/upload WAR package Steps to Deploy a Web Application

Java

Copy/upload WAR package

Java libs can eat complex Excel data!

We can reuse what's good on the Java ecosystem!

Django + Jython: Architecture

The cool side of Java System Programming Concurrency Model Memory Model

System Programming

Concurrency Model

Memory Model

$ jython2.5 ... >>> from __future__ import GIL

$ jython2.5

...

>>> from __future__ import GIL

$ jython2.5 ... >>> from __future__ import GIL Traceback (most recent call last): (no code object) at line 0 File &quot;<stdin>&quot;, line 1 SyntaxError: Never going to happen!

$ jython2.5

...

>>> from __future__ import GIL

Traceback (most recent call last): (no code object) at line 0 File &quot;<stdin>&quot;, line 1

SyntaxError:

Never going to happen!

On the other hand...

J2EE was a big, horrible mistake

The right tool for the right job!

Java : Performance, Heavy lifting, Pre-existing infrastructure

Jython : Everything else :)

Deployment

App Servers: Already there, lots of features

Let's use their force! http://flickr.com/photos/tomloudon/322172413/sizes/l/

Deployment Options Java app servers - show some horizontal scaling; also management - sys admins know how to do this! Hardened - it runs on the JVM

Java app servers - show some horizontal scaling; also management - sys admins know how to do this!

Hardened - it runs on the JVM

vs Google App Engine It’s Django 1.0 We have Unicode, internationalization, ORM, unit tests, admin, shell, everything! And we can use Java analogues: BigTable <=> HBase, Hypertable MapReduce <=> Hadoop Add pictures for app engine, HBase, Hadoop

It’s Django 1.0

We have Unicode, internationalization, ORM, unit tests, admin, shell, everything!

And we can use Java analogues:

BigTable <=> HBase, Hypertable

MapReduce <=> Hadoop

WAR! Web ARchive format Standard deployment for Java app servers Just a bunch of files with a standard directory layout and manifest

Web ARchive format

Standard deployment for Java app servers

Just a bunch of files with a standard directory layout and manifest

$ jython manage.py war --include-java-libs=jdbcdriver.jar

$ jython manage.py war

--include-java-libs=jdbcdriver.jar

100% self-contained!

WAR format for DoJ |-- WEB-INF | |-- lib | `-- lib-python | |-- Lib | |-- django | |-- doj | `-- mysite `-- media super simple bundling!

|-- WEB-INF

| |-- lib

| `-- lib-python

| |-- Lib

| |-- django

| |-- doj

| `-- mysite

`-- media

IDE Integration

Again, why?

Quick Start!

Let People Explore

Re-factoring

One place to rule them all

Let see how that'd be with Django...

Demo

Summary

Questions?

Thanks! Jim's Blog: http://www.zyasoft.com/pythoneering/ Leo's Blog: http://blog.leosoto.com Twitter: jimbaker, leosoto

http://www.flickr.com/photos/purpleslog/231478071 http://www.flickr.com/photos/21054697@N03/2053923652 http://www.flickr.com/photos/vicintosh87/2618725412 http://www.flickr.com/photos/dipster1/1403240351 Images used under CC license

http://www.flickr.com/photos/purpleslog/231478071

http://www.flickr.com/photos/21054697@N03/2053923652

http://www.flickr.com/photos/vicintosh87/2618725412

http://www.flickr.com/photos/dipster1/1403240351