# Modified version of the code featured at the given link
## {{{ http://code.activestate.com/recipes/473786/ (r1)
class AttrDict(dict):
	"""A dictionary with attribute-style access. It maps attribute access to
	the real dictionary."""
	def __init__(self, init={}): super(AttrDict, self).__init__(init)
	def __getstate__(self): return self.__dict__.items()
	def __setstate__(self, items):
		for key, val in items: self.__dict__[key] = val
	def __repr__(self):
		return "%s(%s)" % (
			type(self).__name__,
			super(AttrDict, self).__repr__()
		)
	def __setitem__(self, key, value):
		return super(AttrDict, self).__setitem__(key, value)
	def __getitem__(self, name):
		return super(AttrDict, self).__getitem__(name)
	def __delitem__(self, name):
		return super(AttrDict, self).__delitem__(name)
	__getattr__ = __getitem__
	__setattr__ = __setitem__
	__delattr__ = __delitem__
	def copy(self): return type(self)(self)
## end of http://code.activestate.com/recipes/473786/ }}}

class DefAttrDict(AttrDict):
	def __init__(self, default_factory=None, *args, **kwargs):
		self.__dict__["default_factory"] = default_factory
		super(DefAttrDict, self).__init__(*args, **kwargs)
	def __repr__(self):
		return "%s(%r, %s)" % (
			type(self).__name__,
			self.default_factory,
			super(AttrDict, self).__repr__()
		)
	def __getitem__(self, name):
		try:
			return super(DefAttrDict, self).__getitem__(name)
		except KeyError:
			##if self.default_factory is None: return None
			##return self.default_factory()
			result = None
			if self.default_factory is not None:
				result = self.default_factory()
			self[name] = result
			return result
	__getattr__ = __getitem__
	def copy(self): return type(self)(self.default_factory, self)