## Original algorithm adapted from {{{ http://code.activestate.com/recipes/496741/ (r1)
class Proxy(object):
	__slots__ = ["_obj", "__weakref__"]
	_local = {
		'_setobj':1,
		'_getobj':1
	}
	def __init__(self, obj):
		object.__setattr__(self, "_obj", obj)
	
	#
	# proxying (special cases)
	#
	def __getattribute__(self, name):
		if name in Proxy._local:
			return object.__getattribute__(self, name)
		return getattr(object.__getattribute__(self, "_obj"), name)
	def __delattr__(self, name):
		delattr(object.__getattribute__(self, "_obj"), name)
	def __setattr__(self, name, value):
		setattr(object.__getattribute__(self, "_obj"), name, value)
	
	def __nonzero__(self):
		return bool(object.__getattribute__(self, "_obj"))
	def __str__(self):
		return str(object.__getattribute__(self, "_obj"))
	def __repr__(self):
		return repr(object.__getattribute__(self, "_obj"))
	def __call__(self, *args, **kwargs):
		return object.__getattribute__(self, "_obj")(*args, **kwargs)
	
	def _setobj(self, newobj):
		newclass = Proxy._get_proxy(newobj)
		object.__setattr__(self, "_obj", newobj)
		object.__setattr__(self, "__class__", newclass)
 
	def _getobj(self):
		return object.__getattribute__(self, "_obj")
	
	#
	# factories
	#
	_special_names = [
		'__abs__', '__add__', '__and__', '__call__', '__cmp__', '__coerce__', 
		'__contains__', '__delitem__', '__delslice__', '__div__', '__divmod__', 
		'__eq__', '__float__', '__floordiv__', '__ge__', '__getitem__', 
		'__getslice__', '__gt__', '__hash__', '__hex__', '__iadd__', '__iand__',
		'__idiv__', '__idivmod__', '__ifloordiv__', '__ilshift__', '__imod__', 
		'__imul__', '__int__', '__invert__', '__ior__', '__ipow__', '__irshift__', 
		'__isub__', '__iter__', '__itruediv__', '__ixor__', '__le__', '__len__', 
		'__long__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__', 
		'__neg__', '__oct__', '__or__', '__pos__', '__pow__', '__radd__', 
		'__rand__', '__rdiv__', '__rdivmod__', '__reduce__', '__reduce_ex__', 
		'__repr__', '__reversed__', '__rfloorfiv__', '__rlshift__', '__rmod__', 
		'__rmul__', '__ror__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', 
		'__rtruediv__', '__rxor__', '__setitem__', '__setslice__', '__sub__', 
		'__truediv__', '__xor__', 'next'
	]
	
	@classmethod
	def _get_proxy(cls, obj):
		try:
			cache = cls.__dict__["_class_proxy_cache"]
		except KeyError:
			cls._class_proxy_cache = cache = {}
		try:
			theclass = cache[obj.__class__]
		except KeyError:
			cache[obj.__class__] = theclass = cls._create_class_proxy(obj.__class__)
		return theclass
	
	@classmethod
	def _create_class_proxy(cls, theclass):
		"""creates a proxy for the given class"""
		
		def make_method(name):
			def method(self, *args, **kw):
				return getattr(object.__getattribute__(self, "_obj"), name)(*args, **kw)
			return method
		
		namespace = {}
		for name in cls._special_names:
			if hasattr(theclass, name) and not hasattr(cls, name):
				namespace[name] = make_method(name)
		return type("%s(%s)" % (cls.__name__, theclass.__name__), (cls,), namespace)
	
	def __new__(cls, obj, *args, **kwargs):
		"""
		creates an proxy instance referencing `obj`. (obj, *args, **kwargs) are
		passed to this class' __init__, so deriving classes can define an 
		__init__ method of their own.
		note: _class_proxy_cache is unique per deriving class (each deriving
		class must hold its own cache)
		"""
		theclass = cls._get_proxy(obj)
		ins = object.__new__(theclass)
		#theclass.__init__(ins, obj, *args, **kwargs)
		return ins