action22k ParDescr 8415			Михаил Авраменко, 441 группа ParDescr 7983
t	1	class ParDescr:	t	1	class ParDescr:
	2			2
	3	def __init__(self, initial_value):		3	def __init__(self, initial_value):
	4	self.initial_value = initial_value		4	self.initial_value = initial_value
	5	self.values = {}		5	self.values = {}
	6	self.already_deleted = set()		6	self.already_deleted = set()
	7			7
	8	def __get__(self, instance, owner):		8	def __get__(self, instance, owner):
	9	if instance is None:		9	if instance is None:
	10	return self.initial_value		10	return self.initial_value
	11	return self.values.get(id(instance), self.initial_value)		11	return self.values.get(id(instance), self.initial_value)
	12			12
	13	def __set__(self, instance, value):		13	def __set__(self, instance, value):
	14	instance_id = id(instance)		14	instance_id = id(instance)
	15	self.values[instance_id] = value		15	self.values[instance_id] = value
	16	if instance_id in self.already_deleted:		16	if instance_id in self.already_deleted:
	17	self.already_deleted.remove(instance_id)		17	self.already_deleted.remove(instance_id)
	18			18
	19	def __delete__(self, instance):		19	def __delete__(self, instance):
	20	instance_id = id(instance)		20	instance_id = id(instance)
	21	if instance_id in self.already_deleted:		21	if instance_id in self.already_deleted:
	22	raise KeyError		22	raise KeyError
	23	elif instance_id in self.values:		23	elif instance_id in self.values:
	24	del self.values[instance_id]		24	del self.values[instance_id]
	25	self.already_deleted.add(instance_id)		25	self.already_deleted.add(instance_id)
	26	else:		26	else:
	27	self.already_deleted.add(instance_id)		27	self.already_deleted.add(instance_id)

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