have been made to make it work on Python 2.6 (sched module changes).
The version in Turbogears is based on the original stand-alone Kronos.
This is open-source software, released under the MIT Software License:
http://www.opensource.org/licenses/mit-license.php

"""

__version__="2.0"
__version__="2.1"

__all__ = [
    "DayTaskRescheduler",
    "ForkedIntervalTask",
    "ForkedMonthdayTask",
    "ForkedScheduler",
    "ForkedSingleTask",

    def _run(self):
        # Low-level run method to do the actual scheduling loop.
        while self.running:
            try:
                self.sched.run()
            except Exception as x:
                print >>sys.stderr, "ERROR DURING SCHEDULER EXECUTION",x
                print >>sys.stderr, "".join(
                    traceback.format_exception(*sys.exc_info()))
                print >>sys.stderr, "-" * 20
                print("ERROR DURING SCHEDULER EXECUTION",x, file=sys.stderr)
                print("".join(
                    traceback.format_exception(*sys.exc_info())), file=sys.stderr)
                print("-" * 20, file=sys.stderr)
            # queue is empty; sleep a short while before checking again
            if self.running:
                time.sleep(5)


class Task:
    """Abstract base class of all scheduler tasks"""

    def execute(self):
        """Execute the actual task."""
        self.action(*self.args, **self.kw)

    def handle_exception(self, exc):
        """Handle any exception that occured during task execution."""
        print >>sys.stderr, "ERROR DURING TASK EXECUTION", exc
        print >>sys.stderr, "".join(traceback.format_exception(*sys.exc_info()))
        print >>sys.stderr, "-" * 20
        print("ERROR DURING TASK EXECUTION", exc, file=sys.stderr)
        print("".join(traceback.format_exception(*sys.exc_info())), file=sys.stderr)
        print("-" * 20, file=sys.stderr)


class SingleTask(Task):
    """A task that only runs once."""

    def reschedule(self, scheduler):
        pass

        """Monthday Task that executes in its own process."""
        pass



if __name__=="__main__":
    def testaction(arg):
        print ">>>TASK",arg,"sleeping 3 seconds"
        print(">>>TASK",arg,"sleeping 3 seconds")
        time.sleep(3)
        print "<<<END_TASK",arg
        print("<<<END_TASK",arg)

    s=ThreadedScheduler()
    s.add_interval_task( testaction, "test action 1", 0, 4, method.threaded, ["task 1"], None )
    s.start()
    
    print "Scheduler started, waiting 15 sec...."
    print("Scheduler started, waiting 15 sec....")
    time.sleep(15)
    
    print "STOP SCHEDULER"
    print("STOP SCHEDULER")
    s.stop()
    
    print "EXITING"
    print("EXITING")