old_contents: from .timeline import Timeline
  
  class GeventTimeline(Timeline):
      def sleep(self, time):
          super(GeventTimeline, self).sleep(time)
          if self._time_factor == 0:
              self._real_sleep(0.0)
      def _real_sleep(self, seconds):
          try:
              import gevent
              gevent.sleep(seconds)
          except ImportError:
              super(GeventTimeline, self)._real_sleep(seconds)
  
new_contents: from .timeline import Timeline
  
  class GeventTimeline(Timeline):
      def sleep(self, seconds):
          super(GeventTimeline, self).sleep(seconds)
          if self._time_factor == 0:
              self._real_sleep(0.0)
      def _real_sleep(self, seconds):
          try:
              import gevent
              gevent.sleep(seconds)
          except ImportError:
              super(GeventTimeline, self)._real_sleep(seconds)
  
subject: rename param