title: Extension method for python built-in types
body: <p>is it possible to add extension method to python built-in types?
  I know that I can add extension method to defined type by simply adding new method by . as following:</p>
  
  <pre><code>class myClass:
      pass
  
  myClass.myExtensionMethod = lambda self,x:x * 2
  z = myClass()
  print z.myExtensionMethod(10)
  </code></pre>
  
  <p>But is any way to adding extension method to python built'in types like list, dict, ...</p>
  
  <pre><code>list.myExtension = lambda self,x:x * 2
  list.myExtension(10)
  </code></pre>