Miscellany

import BlenderTRUE = 1FALSE = 0class events:	instances = []	events = []		def __init__(self, parent):		events.instances.append(self)		self.parent = parent		self.event_queue = []			def __del__(self):		events.instance.remove(self)			def add_event(self, function):		events.events.append(function)class layer:	instances = []		def __init__(self, visible=TRUE, depth=0):		layer.instances.append(self)		self.visible = visible		self.depth = depth		self.children = []				def __del__(self):		layer.instances.remove(self)		self.children = None		def add_child(child):		self.children.append(child)			def del_child(child):		self.children.remove(child)		def set_depth(self,depth=0):		self.depth = depth		def get_depth(self):		return self.depth		def set_visible(self, visible=TRUE):		self.visible = visible		def get_visible(self):		return self.visibleclass element:	instances = []		def __init__(self, parent):		element.instances.append(self)		self.parent = parent		self.visible = parent.visible		self.child = None		self.events = events(self)		def __del__(self):		element.instances.remove(self)		self.parent = None		def set_parent(self, parent):		parent.add_child(self)		self.parent.del_child(self)			def get_parent(self):		return self.parent			def set_visible(self, visible=TRUE):		self.visible = visible		def get_visible(self):		return self.visible		def set_parent(self, parent):		parent.add_child(self)		self.parent.del_child(self)			def get_parent(self):		return self.parent