Dimitry BorgSum 6029			Mikhailenko Alexandr Sergeevich 316 BorgSum 5637
f	1	import weakref	f	1	import weakref
	2			2
	3	class Borg:		3	class Borg:
n	4	_all = []	n	4	refs = []
	5			5
	6	def __init__(self, value=0):		6	def __init__(self, value=0):
n	7	self._value = value	n	7	self.value = value
	8	Borg._all.append(weakref.ref(self))		8	self.refs.append(weakref.ref(self))
	9			9
	10	def __str__(self):		10	def __str__(self):
n	11	return str(self._value)	n	11	return str(self.value)
	12			12
	13	def __iter__(self):		13	def __iter__(self):
n	14	for ref in Borg._all:	n	14	for ref in self.refs:
	15	inst = ref()		15	obj = ref()
	16	if inst is not None:		16	if obj is not None:
	17	yield inst._value		17	yield obj.value
	18			18
n	19	def __iadd__(self, num):	n	19	def __iadd__(self, other):
	20	for ref in Borg._all:		20	for ref in self.refs:
	21	inst = ref()		21	obj = ref()
	22	if inst is not None:		22	if obj is not None:
	23	inst._value += num		23	obj.value += other
	24	return self		24	return self
	25			25
t	26	def __isub__(self, num):	t	26	def __isub__(self, other):
	27	for ref in Borg._all:		27	for ref in self.refs:
	28	inst = ref()		28	obj = ref()
	29	if inst is not None:		29	if obj is not None:
	30	inst._value -= num		30	obj.value -= other
	31	return self		31	return self

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