david_Yakhin_312 BorgSum 6594			Владислав Ренкас, 321 BorgSum 6559
f	1	import weakref	f	1	import weakref
	2			2
	3	class Borg:		3	class Borg:
n	4	_instances = []	n	4	_refs = []
	5			5
	6	def __init__(self, value=0):		6	def __init__(self, value=0):
	7	self.value = value		7	self.value = value
n	8	Borg._instances.append(weakref.ref(self))	n	8	Borg._refs.append(weakref.ref(self))
	9			9
	10	def __str__(self):		10	def __str__(self):
	11	return str(self.value)		11	return str(self.value)
	12			12
	13	def __repr__(self):		13	def __repr__(self):
n	14	return str(self.value)	n	14	return str(self)
	15			15
	16	def __iter__(self):		16	def __iter__(self):
n	17	for ref in Borg._instances:	n	17	for r in Borg._refs:
	18	obj = ref()		18	obj = r()
	19	if obj is not None:		19	if obj is not None:
	20	yield obj.value		20	yield obj.value
	21			21
n	22	def __iadd__(self, other):	n	22	def __iadd__(self, num):
	23	for ref in Borg._instances:		23	for r in Borg._refs:
	24	obj = ref()		24	obj = r()
	25	if obj is not None:		25	if obj is not None:
n	26	obj.value += other	n	26	obj.value += num
	27	return self		27	return self
	28			28
n	29	def __isub__(self, other):	n	29	def __isub__(self, num):
	30	for ref in Borg._instances:		30	for r in Borg._refs:
	31	obj = ref()		31	obj = r()
	32	if obj is not None:		32	if obj is not None:
t	33	obj.value -= other	t	33	obj.value -= num
	34	return self		34	return self

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