The document discusses using Django with Jython to build web applications that can leverage both the Python and Java ecosystems. Some key points covered include: - Jython allows running Python code on the Java Virtual Machine, enabling access to Java libraries and deployment on Java application servers. - Django applications can be bundled and deployed as WAR files to standard Java application servers, providing features like load balancing and management tools. - Using Jython and Java application servers allows leveraging existing Java infrastructure while still using Python and Django for rapid development and their strengths in areas like web development. - Examples of deployment options like Google App Engine are compared, with Java application servers being presented as having advantages in areas like scalability and

1. Django on Jython Jim Baker Leo Soto

2. Jython Status

3. Shipped 2.5 (beta3)

4. Greatly improved “compatibility”

5. setuptools

6. virtualenv

7. nose

8. etree

11. web 2 py

14. Django + Jython: Why?

15. Installing this Django app...

16. ...in an Enterprise Infrastructure

17. (I mean, this kind of enterprise infrastructure)

18. Didn't work quite well

19. Guess how much time it took

20. We like Python They need Java

21. Jython

22. Avoiding Java Sneaking Python Is that it?

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

24. Examples...

25. 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

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

27. Java libs can eat complex Excel data!

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

29. Django + Jython: Architecture

30. The cool side of Java System Programming Concurrency Model Memory Model

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

32. $ 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!

33. On the other hand...

34. J2EE was a big, horrible mistake

35. The right tool for the right job!

36. Java : Performance, Heavy lifting, Pre-existing infrastructure

37. Jython : Everything else :)

38. Deployment

39. App Servers: Already there, lots of features

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

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

42. 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

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

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

45. 100% self-contained!

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

47. IDE Integration

48. Again, why?

49. Quick Start!

50. Let People Explore

51. Re-factoring

52. One place to rule them all

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

54. Demo

55. Summary

56. Questions?

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

58. 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