import itertools
 def dict_merge(dct1, dct2):
 	commonkeys = set(dct1) & set(dct2)
 	newkeys = set(dct2) - commonkeys
 
 	for key in commonkeys:
 		olditem = dct1[key]
 		newitem = dct2[key]
 		if hasattr(newitem, 'items') and hasattr(olditem, 'items'):
 			dict_merge(olditem, newitem)
 		elif hasattr(olditem, 'update') and hasattr(newitem, '__iter__'):
 			olditem.update(newitem)
 		elif hasattr(olditem, 'extend') and hasattr(newitem, '__iter__'):
 			olditem.extend(newitem)
 		else:
 			dct1[key] = dct2[key]
 	dct1.update( (k,dct2[k]) for k in newkeys )
 	return dct1
 
 
 class _Null: pass
 class Hier(object):
 	####################
 	# Class Attributes #
 	####################
 
 	@classmethod
 	def init(cls):
 		if not hasattr(cls, 'hier'):
 			cls.hier = {}
 
 	@classmethod
 	def from_dict(cls, dct):
 		cls.init()
 		dict_merge(cls.hier, dct)
 		return cls()
 
 	#######################
 	# Instance Attributes #
 	#######################
 
 	def __init__(self, name=''):
 		self.init()
 
 		self._name = name
 
 		self._values = self.hier
 		for segment in self._name.split('.'):
 			item = self._values.get(segment)
 			if hasattr(item, 'items'):
 				print item
 				self._values = item
 			elif name != '':
 				raise ValueError('no such item: %r' % self._name)
 
 	def __getattribute__(self, name):
 		try:
 			return object.__getattribute__(self, name)
 		except AttributeError:
 			if name in self._values:
 				result = self._values[name]
 				if hasattr(result, 'items'):
 					if self._name == '': result = Hier(name)
 					else: result = Hier('%s.%s' % (self._name, name))
 				return result
 			else:
 				raise