def lazy(f):
	'''
	Prevents certain properties from having to be recomputed each time they are
	referenced
	'''
	def wrapper(*args, **kwargs):
		o = args[0]
		if "_lazy" not in o.__dict__: o.__dict__["_lazy"] = {}
		if f.__name__ not in o.__dict__["_lazy"]: 
			o.__dict__["_lazy"][f.__name__] = f(*args, **kwargs)
		return o.__dict__["_lazy"][f.__name__]
	wrapper.__name__ = f.__name__
	return wrapper