title: Access superclass' property setter in subclass
body: <p>I have a SuperClass which defines a property and it's setter, like so:</p>
  
  <pre><code>class A(object):
      def __init__(self):
          self._mode = None
  
      @property
      def mode(self):
          # to be overriden in subclass to implement the actual getter code
          raise NotImplementedError
  
      @mode.setter
      def mode(self, value):
          # common assertions and input validations
          self._set_mode(value)
  
      def _set_mode(self, value):
          # to be overriden in subclass to implement the actual setter code
          raise NotImplementedError
  
  
  class B(A):
      @property
      def mode(self):
          return self._mode
  
      def _set_mode(self, value):
          self._mode = value
  
  
  obj = B()
  obj.mode = 'test'
  </code></pre>
  
  <p>Which raises </p>
  
  <pre><code>obj.mode = 'test'
  AttributeError: can't set attribute
  </code></pre>
  
  <p>It would seem that I have to register a setter in B. I'd usually do this like <code>@A.mode.setter</code>, but that doesn't quite apply here as I don't actually want to define a new setter in B, just re-use the one from A.<br>
  Does anyone have a hint on how to solve this? Might be trivial, but I'm not seeing it right now :/</p>