Python Singleton Wrapper (Design Pattern)

SingletonWrapper.py

class ExpensiveObjectToCreate(object):
    '''Insert code here'''
    pass
    def __init__(self,**kwargs):
        self.params = kwargs

    def check(self):
        print self.params



class SingletonWrapper(object):
    """
    Wraps an expensive-to-create object that only needs to be initialized once.
    """
    def __new__(self,**kwargs):
        """
        Returns the expensive object, self.bling
        """
        try:
            return self.bling 
        except AttributeError:
            self.bling = ExpensiveObjectToCreate(**kwargs)
            return self.bling

if __name__=="__main__":
    d = { 'a':1, 
          'b':2, 
          'c':'dog'}

    print "Init data:"
    print d

    print "Creating an instance of the singleton wrapper..."
    ps = SingletonWrapper(**d)
    print "Done.\n"

    print "Creating a second instance of the singleton wrapper..."
    ps2 = SingletonWrapper()
    print "Done.\n"

    print "Here's the second instance's data:"
    ps2.check()