python的 slots使用，pythonslots使用,class PointW

python的 slots使用，pythonslots使用,class PointW

class PointWithoutSlots:   def __init__( self, xValue = 0.0, yValue = 0.0 ):      self.x = float( xValue )      self.y = float( yValue )class PointWithSlots( object ):   __slots__ = [ 'x', 'y' ]   def __init__( self, xValue = 0.0, yValue = 0.0 ):      self.x = float( xValue )      self.y = float( yValue )noSlots = PointWithoutSlots()slots = PointWithSlots()for point in [ noSlots, slots ]:   print '\nProcessing an object of class', point.__class__   print 'point.x is:', point.x   newValue = float( raw_input( 'Enter new x coordinate: ' ) )   print 'set new x-coordinate value...'   point.X = newValue   print 'The new value of point.x is:', point.x