Re: [thredds] Java to Python tools

Hi Stephen,

One of the goals is to expose the CDM to cPython (so Jython is out). We see many of our users (myself included) are/have moved to a cPython/Numpy/Scipy/Matplotlib environment for scientific analysis of their data, and it would be great to give them access to the CDM without rewriting everything in cPython.

Thanks everyone for the feedback thus far!

Cheers!

Sean

On 04/04/12 07: 38, stephen.pascoe@xxxxxxxxxx wrote:
The important question is why you need Python.  If it's to access some C library with 
python bindings (e.g. numpy or netCDF4-python) then Jython isn't appropriate and 
you'll need one of those Python<->bridges JPype or Jepp.

If you need the very latest Python features (particularly Python 3) you'll also 
find Jython is a bit behind CPython.  Many standard Python frameworks now work 
with Jython (e.g. Django, SQLAlchemy) but you'd have to check the compatibility 
of each dependency.

Otherwise Jython is the most popular and well maintained choice.

Depending on your application you could also wire Java and Python together 
using inter-process communication.  There is a plethora of RPC libraries out 
there with good Python and Java support.  E.g. protocol buffers.

Stephen.

---
Stephen Pascoe  +44 (0)1235 445980
Centre of Environmental Data Archival
STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK


-----Original Message-----
From: Robert Casey [mailto:rob@xxxxxxxxxxxxxxxxxxx]
Sent: 04 April 2012 14:31
To: Pascoe, Stephen (STFC,RAL,RALSP); John Caron
Cc: netcdf-java@xxxxxxxxxxxxxxxx; thredds@xxxxxxxxxxxxxxxx
Subject: Re: [thredds] Java to Python tools


        Hi John-

        If you use Jython, it looks to be pretty seamless.  I am just
starting to develop in Jython, so I can't claim experience in this
department yet.  The first section of this page details Java within
Jython.

        http://www.jython.org/jythonbook/en/1.0/JythonAndJavaIntegration.html

        -Rob


On Apr 4, 2012, at 1:02 AM,<stephen.pascoe@xxxxxxxxxx>  wrote:

Hi John,

Direct experience beyond playing, no; but I've come across several
options:

* Jpype  : http://sourceforge.net/project/jpype -- embeds a JVM in
Python
* Jepp   : http://jepp.soureforge.net -- embeds Python interpreter
in Java
* Jython : http://www.jython.org -- A Python implementation in the
JVM.

I expect you want Jpype as in your case Python is doing the
wrapping.  I tested it out once and it worked for me.  The project
seems isn't exactly active but it still appears to be in use.

Cheers,
Stephen.

---
Stephen Pascoe  +44 (0)1235 445980
Centre of Environmental Data Archival
STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11
0QX, UK


-----Original Message-----
From: thredds-bounces@xxxxxxxxxxxxxxxx [mailto:thredds-bounces@xxxxxxxxxxxxxxxx
] On Behalf Of John Caron
Sent: 04 April 2012 00:20
To: Java NetCDF; THREDDS community
Subject: [thredds] Java to Python tools

Hi all:

Anyone have experience with ways to wrap java in Python? We are
thinking
about how to solve this issue again.

John

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