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property confusion


Could someone please explain to me why the two values at the bottom of 
this example are different?

Python-3.3 if it makes any difference.

Is this a difference in evaluation between a class attribute and an 
instance attribute?

--rich

class C:
     def __init__(self):
         self._x = None

     def getx(self):
         print('getx')
         return self._x
     def setx(self, value):
         print('setx')
         self._x = value
     def delx(self):
         print('delx')
         del self._x
     x = property(getx, setx, delx, "I'm the 'x' property.")

class D:
     def getx(self):
         print('getx')
         return self._x
     def setx(self, value):
         print('setx')
         self._x = value
     def delx(self):
         print('delx')
         del self._x

     def __init__(self):
         self._x = None
         self.x = property(self.getx, self.setx, self.delx, "I'm the 'x' 
property.")

type(C().x)
type(D().x)