[Classless] Just to be sure...

From: Yermat (loic_at_fejoz.net)
Date: 04/30/04 

Date: Fri, 30 Apr 2004 16:11:47 +0200

Hi all,
I just want to be sure that I have really understand what classless
means... Can you look at the following "test" function and tell me if
this is what you would have called classless programmation ?

thanks ! 

-- 
Yermat
import types
PropertyType = type(property())
class Prototype(object):
     parent = None
     def __init__(self, parent=None):
         self.parent = parent
     def clone(self):
         return Prototype(self)
     def __hasattr__(self, name):
         if name in self.__dict__:
             return True
         elif self.parent!= None:
             return self.parent.__hasattr__(self, name)
         else:
             return False
     def __getattribute__(self, name):
         if name in ['__dict__', 'parent']:
             return object.__getattribute__(self, name)
         if name in self.__dict__:
             val = self.__dict__[name]
         elif self.parent != None:
             val = getattr(self.parent, name)
         else:
             val = object.__getattribute__(self, name)
         if type(val) in [types.FunctionType, types.GeneratorType, 
types.UnboundMethodType, types.BuiltinFunctionType]:
             return val.__get__(self, self.__class__)
         if type(val) == PropertyType:
             return val.fget(self)
         return val
     def __setattr__(self, name, value):
         if type(value) == types.MethodType:
             value = value.im_func
         self.__dict__[name] = value
     def __add__(self, other):
         return self.__add__(other)
def test():
     import random
     def show(self):
         print '(%s, %s)' % (self.x, self.y)
     def addPoint(self, other):
         r = self.clone()
         r.x = self.x + other.x
         r.y = self.y + other.y
         return r
     point = Prototype()
     point.show = show
     point.__add__ = addPoint
     a1 = point.clone()
     a1.x = 3
     a1.y = 5
     a2 = point.clone()
     a2.x = 7
     a2.y = 9
     print 'a1: ',
     a1.show()
     print 'a2: ',
     a2.show()
     def getX(self):
         return random.randint(0, 10)
     print 'a3:'
     a3 = a2.clone()
     a3.x = property(getX)
     print a3.x
     a3.show()
     a3.show()
     a3.show()
     a2.y = 10
     print 'a3: ',
     a3.show()
     p = a3.__add__(a2)
     print 'p = a3 + a2: ',
     p.show()
     print 'a3 + a2: ',
     (a3 + a2).show()
     def squareDistance(self):
         return (self.x ** 2) + (self.y ** 2)
     point.squareDistance = squareDistance
     a4 = a1.clone()
     print 'a4: ',
     a4.show()
     print a4.squareDistance()
     def pointTuple(self):
         return (self.x, self.y)
     a5 = a3.clone()
     a5.tuple = pointTuple
     print 'a5: ', a5.tuple()
     a5.x = 10
     print 'a5: ', a5.tuple()
     print 'a3: ',
     a3.show()
if __name__=='__main__':
     test()

Relevant Pages