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I'm not much of a Python programmer, but you should be able to print to stdout from within a PythonScript actor, see below where I added to print() calls to the script.

BCVTB used Ptolemy II as its execution engine. In Ptolemy II, it is possible to listen to actors by right clicking on the actor and selecting "Listen to Actor". At runtime, messages will be displayed in a separate window. To write to the listener from within your Python code, see https://chess.eecs.berkeley.edu/ptexternal/src/ptII/doc/codeDoc/ptolemy/actor/lib/python/PythonScript.html:

In the script, use self.actor to access the actor. For example, self.actor.getDirector() returns the current director of the actor. For debugging, use self.actor.debug(someMessage). The final message sent to the debug listeners of the actor will have the string "From script: " inserted at the beginning. To avoid generating the debug message when there are no listeners, use:

if self.actor.isDebugging() : 
    self.actor.debug(someMessage)

I'm not sure about the indentation of the above.

To print to an output, see $PTII/ptolemy/actor/lib/python/test/PythonSysPath.xml , which has a PythonActor with the following. Note that I added two print() calls, which seem to work.

import sys.path

import ptolemy.data.type.BaseType
import ptolemy.data.StringToken

class Main :
  "Report the components of Jython's syspath"
  def preinitialize(self):
    self.output.setTypeEquals(ptolemy.data.type.BaseType.STRING)
  def prefire(self):
    return self.input.hasToken(0)
  def fire(self) :
    y=self.input.get(0) # retrieve and discard the trigger
    result=""
    sp=sys.path
    for i in range(len(sp)) :
      if (len(result) > 0):
          result+="\n"
      result+=sp[i]
    print('The result is')
    print(result)
    self.output.broadcast(ptolemy.data.StringToken(result))
    return