post init call

Mon Jun 18 03:10:53 EDT 2012

class Shape(object):
 def __init__(self, shapename):
 self.shapename = shapename

 def update(self):
 print "update"
class ColoredShape(Shape):
 def __init__(self, color):
 Shape.__init__(self, color)
 self.color = color
 print 1
 print 2
 print 3
 self.update()
User can sub-class 'Shape' and create custom shapes. How ever user must call 'self.update()' as the last argument when ever he is sub-classing 'Shape'.
I would like to know if it's possible to call 'self.update()' automatically after the __init__ of sub-class is done?
Cheers