title: Call base class method when derived class overloads it
body: <p>I have the following:</p>
  
  <pre><code>class A(object):
      def x(self): print "Hello"
      def y(self): self.x()
  
  class Abis(A):
      def x(self): print "Bye"
  
  a = Abis()
  a.x()
  a.y()
  </code></pre>
  
  <p>Which prints:</p>
  
  <pre><code>Bye
  Bye
  </code></pre>
  
  <p>But I actually wanted:</p>
  
  <pre><code>Bye
  Hello
  </code></pre>
  
  <p>Since I want <code>A.y</code> to call the "original" <code>A.x</code>. How can I reference the original <code>A.x</code> in <code>A</code>, when the derived class has overloaded it?</p>