def stop_times(self):
    """Return all stop_times for this agency."""
    stop_times = set()
    for trip in self.trips():
      stop_times |= trip.stop_times()
    return stop_times
def stop_times ( self ) : stop_times = set ( ) for trip in self . trips ( ) : stop_times |= trip . stop_times ( ) return stop_times
Return all stop_times for this agency.