post init call

Mon Jun 18 06:21:59 EDT 2012

Am 18.06.2012 09:10 schrieb Prashant:
> 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

I would construct it this way:
class Shape(object):
 def __init__(self, *args):
 self.args = args
 self.init()
 self.update()
 # or: if self.init(): self.update()
 def init(self):
 return False # don't call update
 def update(self):
 print "update"
 @propery
 def shapename(self): return self.args[0]
class ColoredShape(Shape):
 def init(self):
 print 1, 2, 3
 self.update()
 return True
 @property
 def color(self): return self.args[1]
Thomas