High level Python features

My mind has been blown.

Python Meta-classes – http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python/6581949#6581949

Python’s Yield function – http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained

Python’s Decorators – http://stackoverflow.com/questions/739654/understanding-python-decorators