new_contents: #!/usr/bin/env python
  # Tai Sakuma <sakuma@fnal.gov>
  from AlphaTwirl.ProgressBar import ProgressBar, MPProgressMonitor, ProgressReport
  from AlphaTwirl.EventReader import MPEventLoopRunner
  import time, random
  
  ##____________________________________________________________________________||
  class EventLoop(object):
      def __init__(self, name):
          self.name = name
          self.readers = [ ]
      def __call__(self, progressReporter = None):
          n = random.randint(5, 50)
          for i in xrange(n):
              time.sleep(0.1)
              report = ProgressReport(name = self.name, done = i + 1, total = n)
              progressReporter.report(report)
          return self.readers
  
  ##____________________________________________________________________________||
  progressBar = ProgressBar()
  progressMonitor = MPProgressMonitor(presentation = progressBar)
  runner = MPEventLoopRunner(progressMonitor = progressMonitor)
  runner.begin()
  runner.run(EventLoop("loop1"))
  runner.run(EventLoop("loop2"))
  runner.run(EventLoop("loop3"))
  runner.run(EventLoop("loop4"))
  runner.run(EventLoop("loop5"))
  runner.run(EventLoop("loop6"))
  runner.run(EventLoop("loop7"))
  runner.run(EventLoop("loop8"))
  runner.end()
  
  ##____________________________________________________________________________||
  
subject: add an exmple progressbar.py