[kepler-dev] PythonScript actor

Dan Higgins higgins at nceas.ucsb.edu
Wed Mar 12 12:26:13 PDT 2008

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) :
    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)

Now, I CAN get the above script to work OK when I add the following to 
the Kepler java startup command


i.e. when I create a new property 'python.home = <path to my jython home 

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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