old_contents: try:
      import greenlet
      getcurrent = greenlet.getcurrent
      GreenletExit = greenlet.GreenletExit
      greenlet = greenlet.greenlet
  except ImportError, e:
      raise
      try:
          from py.magic import greenlet
          getcurrent = greenlet.getcurrent
          GreenletExit = greenlet.GreenletExit
      except ImportError:
          try:
              from stackless import greenlet
              getcurrent = greenlet.getcurrent
              GreenletExit = greenlet.GreenletExit
          except ImportError:
              try:
                  from support.stacklesss import greenlet, getcurrent, GreenletExit
              except ImportError, e:
                  raise ImportError("Unable to find an implementation of greenlet.")
  
new_contents: try:
      import greenlet
      getcurrent = greenlet.getcurrent
      GreenletExit = greenlet.GreenletExit
      greenlet = greenlet.greenlet
  except ImportError, e:
      raise
      try:
          from py.magic import greenlet
          getcurrent = greenlet.getcurrent
          GreenletExit = greenlet.GreenletExit
      except ImportError:
          try:
              from stackless import greenlet
              getcurrent = greenlet.getcurrent
              GreenletExit = greenlet.GreenletExit
          except ImportError:
              try:
                  from support.stacklesss import greenlet, getcurrent, GreenletExit
                  (greenlet, getcurrent, GreenletExit) # silence pyflakes
              except ImportError, e:
                  raise ImportError("Unable to find an implementation of greenlet.")
  
subject: tweak to silence false alarm in pyflakes report