See in http://nbviewer.ipython.org/gist/migonzalvar/9416931

mixin_super.ipynb

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 "metadata": {
  "name": "mixin_super"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": "This snippet shows how to implement mixins and assure all methods in the final class chain are invoked.\n\n\nReference: http://rhettinger.wordpress.com/2011/05/26/super-considered-super/"
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": "class MixinBase(object):\n    # Every mixin must inherint from this class to assure chain is not broken. It also\n    # allows to invoke super() in the mixin knowing it's going to find the method in the \n    # parent.\n    def setUp(self):\n        assert not hasattr(super(MixinBase, self), 'setUp')\n        \nclass MixinOne(MixinBase):\n    def setUp(self):\n        print('M1')\n        # Don't forget to invoke super()\n        super(MixinOne, self).setUp()\n        \nclass MixinTwo(MixinBase):\n    def setUp(self):\n        print('M2')\n        # Don't forget to invoke super()\n        super(MixinTwo, self).setUp()\n        \nclass C12(MixinOne, MixinTwo):\n    # Mixins invoked from left to right\n    pass\n\nclass C21(MixinTwo, MixinOne):\n    # Mixins invoked from left to right\n    pass\n",
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 12
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": "i12 = C12()\ni12.setUp()",
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": "M1\nM2\n"
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": "i21 = C21()\ni21.setUp()",
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": "M2\nM1\n"
      }
     ],
     "prompt_number": 14
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": "",
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
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