Jython 101

Inspired by Joe Gregario, I thought I'd take a gander at Jython.
The proposed JythonSprint seemed to suggest that unicodedata was required, so I thought I'd have a play and maybe even contribute something. We'll see.

So, grab the main trunk from subversion and off we go. TDD all the way, as much as possible. Are you sitting comfortably? Then I'll begin...

Step 1 - create an ant.properties file. This is in .cvsignore, so no worries about clashing with anyone else's settings. Straight off the developer guide.

build.compiler=modern
debug=on
optimize=off

Step 2 - build it using ANT.

Step 3 - make it accessible. I don't have jython on my machine already, so I take the dirty approach.

sudo vi /usr/bin/jython
#!/bin/sh

export JYTHON_HOME=/home/jabley/work/workspaces/main/jython
exec java -Dpython.home=${JYTHON_HOME}/dist/ -jar ${JYTHON_HOME}/dist/jython.jar $*


Slight tweak from the development guide, and yes, I'm using Eclipse.

sudo chmod 755 /usr/bin/jython

Now see what it looks like:

jython
*sys-package-mgr*: processing new jar, '/home/jabley/work/workspaces/main/jython/dist/jython.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/rt.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/jsse.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/jce.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/charsets.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/ext/sunjce_provider.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/ext/sunpkcs11.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/ext/localedata.jar'
*sys-package-mgr*: processing new jar, '/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/ext/dnsns.jar'
Jython 2.2b1 on java1.5.0_06 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>>


Cool.

Next run the tests.

jython dist/Lib/test/test_unicodedata.py
Testing Unicode Database...
Methods: 38ef24ef104d52e24f9b7c942676c6961f9233cc
Traceback (innermost last):
File "dist/Lib/test/test_unicodedata.py", line 84, in ?
ImportError: no module named unicodedata


That's expected. So I added a class org.python.modules.unicodedata and added an entry in org.python.modules.Setup to have a unicodedata module. I'll probably go back to the class name and maybe create it's own package longer-term, but that's the simplest thing for now. Tests again.

jython dist/Lib/test/test_unicodedata.py
*sys-package-mgr*: processing modified jar, '/home/jabley/work/workspaces/main/jython/dist/jython.jar'
Testing Unicode Database...
Methods: 38ef24ef104d52e24f9b7c942676c6961f9233cc
Functions:Traceback (innermost last):
File "dist/Lib/test/test_unicodedata.py", line 86, in ?
File "dist/Lib/test/test_unicodedata.py", line 62, in test_unicodedata
AttributeError: class 'org.python.modules.unicodedata' has no attribute 'digit'

I seem to recall reading about some script that will generate stubs for these things - gexpose.py? I'll have a look, but otherwise it looks like my next step will be implementing stubs for the required methods and see where the tests fail next.