[kepler-dev] PythonScript actor

[Christopher Brooks]

Hi Dan,
I had a look at this and the news is good!

When you install Jython, you can create a standalone
jython.jar which includes the cached versions of the
jar files and it looks like it includes the files
necessary to run the code below.

I created $PTII/ptolemy/actor/lib/python/test/auto/PythonReadFile.xml
that uses your sample code.

The original Jython 2.2.1 jython.jar that I was using
would not work, I got a message about
ImportError: no module named javaos

When I reinstalled Jython by choosing the "Standalone" option, this
create a new jython.jar that then permitted the model to work.
I checked in that jython.jar into $PTII/lib.

One issue is that the jython.jar might have a cache of certain jar
files or be otherwise hardwired to my particular set up.

I modified configure.in so that it looks for jython in the path
and uses that directory if it is found and then checks for --with-jython.

I also modified $PTII/bin/ptinvoke.in to add -Dpython.home.

_Christopher

Christopher Brooks wrote:
> Hi Dan,
> There are some examples in $PTII/ptolemy/actor/lib/python/test/auto
> Other than that, I don't know of anything.
> 
> It could easily be that we have to set the python.home property.
> This would make Jython less useful because it would make deployment
> difficult because deployment would require installing the Jython
> directory.  The proper solution for the the Jython developers is
> to ship one jar file that contains the files in the python.home
> directory.  The other problem with Jython is that the jar cache
> wants to write on the disk.  
> 
> I can look at modifying $PTII/bin/vergil so that it includes
> the python.home hack.  Or, perhaps the Jython actors should
> be smart enough to set this themselves by looking for the jython.jar
> file in the classpath?  
> 
> BTW - the PythonScript actor can change, I don't think there is
> much use of it, so evolving it to something more useful seems
> appropriate.
> 
> _Christopher
> 
> 
> --------
> 
>     Hi Christopher,
>     
>         I have been playing with the PythonScript actor in Kepler/PTII (as 
>     part of an effort to learn Python/Jython). I am familiar with the 
>     examples in $PTII/ptolemy/actors/lib/python/ and the Python actors works 
>     fine with those examples in Kepler and PTII. Are there any more examples 
>     of Python scripts in PTII?
>     
>         One reason I ask is that I was trying to get the script below to 
>     work in Kepler and PTII and I run into several errors, athough it works 
>     OK when executed directly with the jython command line interpreter. (The 
>     problem is with importing the os module and in finding the file named on 
>     the the input port)
>     
>     
>     import os
>     from ptolemy.data import IntToken
>     class Main :
>       "Number of lines"
>       def fire(self) :
>         if not self.input.hasToken(0) :
>           return
>         t = self.input.get(0)
>         fs = t.toString()
>         # Note the fs includes quotes at both ends that must be removed !
>         print fs[1:len(fs)-1]
>         file = open(fs[1:len(fs)-1],'r')
>         lines = file.readlines();
>         cnt = len(lines)
>         cwd = os.getcwd()
>         st = IntToken(cnt)
>         self.output.broadcast(st)
>     
>     Now, I CAN get the above script to work OK when I add the following to 
>     the Kepler java startup command
>     
>     -Dpython.home=/Users/higgins/jython2.2.1
>     
>     i.e. when I create a new property 'python.home = <path to my jython home 
>     directory>
>     
>     I guess I am just questioning the setup for the PythonScript actor in 
>     Kepler and PTII. Setting python.home does seem to work OK when one has a 
>     jython installation but I haven't figured out how to set up jython 
>     within Kepler for more complicated scripts. In any case, it looks like 
>     just adding jython.jar to the classpath is not sufficient for some scripts.
>     
>     Dan Higgins
> --------
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