python singleton

singleton.py

 
class Singleton(object):
    """
    Singleton interface:
    http://www.python.org/download/releases/2.2.3/descrintro/#__new__
    """
    def __new__(cls, *args, **kwds):
        it = cls.__dict__.get("__it__")
        if it is not None:
            return it
        cls.__it__ = it = object.__new__(cls)
        it.init(*args, **kwds)
        return it
 
    def init(self, *args, **kwds):
        pass
      
class Me(Singleton):
  
  _data = []
  
  def init(self, me):
    print me