There's no support for metaclasses. type is missing entirely. nonlocal doesn't work. docstrings and some other double underscore names are just missing (__class__, __name__, etc.). Unicode literals don't work. dis obviously won't work since there isn't a bytecode compilation step. Scoping, like in the following code, behaves improperly:

  x = 1  
  def test():  
      print(x)  
      x = 2