new_contents: class hashtable(SearchableContainer):
  
  	def __init__(self):
  		super(hashtable, self).__init__()
  
  	def __len__(self):
  		pass
  	__len__ = abstractmethod(__len__)
  
  	def getLoadFactor(self):
  		return self.count / len(self)
  
  	loadFactor = property(
  		fget = lambda self: self.getLoadFactor())
  
subject: add hash table