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telepenin/gc_and_weakref.ipynb

Created August 6, 2013 17:38
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gc and weakref
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gc_and_weakref.ipynb
{
"metadata": {
"name": "gc_weakref"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": "\u0420\u0430\u0431\u043e\u0442\u0430 \u0441 \\__new__ \u0438 \\__init__"
},
{
"cell_type": "code",
"collapsed": false,
"input": "class Circle(object):\n def __init__(self, radius):\n self.radius = radius",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 58
},
{
"cell_type": "code",
"collapsed": false,
"input": "c = Circle(3.0)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 59
},
{
"cell_type": "code",
"collapsed": false,
"input": "d = Circle(4.0)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 60
},
{
"cell_type": "code",
"collapsed": false,
"input": "e = Circle.__new__(Circle, 5.0)\nif isinstance(e, Circle):\n Circle.__init__(e, 5.0)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 61
},
{
"cell_type": "code",
"collapsed": false,
"input": "e.radius",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "pyout",
"prompt_number": 62,
"text": "5.0"
}
],
"prompt_number": 62
},
{
"cell_type": "markdown",
"metadata": {},
"source": "\u041d\u0430\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u0442 \u043d\u0435\u0438\u0437\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0442\u0438\u043f\u043e\u0432, \u0447\u0442\u043e\u0431\u044b \u0443\u0441\u043f\u0435\u0442\u044c \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0412 \\__init__ \u0431\u044b\u043b\u043e \u0431\u044b \u043f\u043e\u0437\u0434\u043d\u043e"
},
{
"cell_type": "code",
"collapsed": false,
"input": "class Upperstr(str):\n def __new__(cls, value=\"\"):\n return str.__new__(cls, value.upper())",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 63
},
{
"cell_type": "code",
"collapsed": false,
"input": "Upperstr(\"hello\")",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "pyout",
"prompt_number": 64,
"text": "'HELLO'"
}
],
"prompt_number": 64
},
{
"cell_type": "markdown",
"metadata": {},
"source": "\\__del__ \u0437\u0430\u0447\u0435\u043c \u043d\u0430\u0434\u043e \u0438 \u043a\u043e\u0433\u0434\u0430 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f\n\u0421\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432: \u043f\u043e\u0434\u0441\u0447\u0435\u0442 \u0441\u0441\u044b\u043b\u043e\u043a \u0438 \u0441\u0431\u043e\u0440\u043a\u0430 \u043c\u0443\u0441\u043e\u0440\u0430.\n\u0418\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044f del"
},
{
"cell_type": "code",
"collapsed": false,
"input": "class Account(object):\n def __init__(self, name, balance):\n self.name = name\n self.balance = balance\n self.observers = set()\n \n def __del__(self):\n for ob in self.observers:\n ob.close()\n del self.observers\n \n def register(self, observer):\n self.observers.add(observer)\n \n def unregister(self, observer):\n self.observers.remove(observer)\n \n def notify(self):\n for ob in self.observers:\n ob.notify()\n \n \nclass AccountObserver(object):\n def __init__(self, account):\n self.account = account\n account.register(self)\n \n def __del__(self):\n self.account.unregister(self)\n del self.account\n \n def update(self):\n print(\"Balance: %0.2f\" % self.account.balance)\n \n def close(self):\n print(\"Observer disconnected\")",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 65
},
{
"cell_type": "code",
"collapsed": false,
"input": "a = Account(\"one\", 1000.00)\na_ob = AccountObserver(a)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 66
},
{
"cell_type": "markdown",
"metadata": {},
"source": "\u041c\u043e\u0434\u0443\u043b\u044c gc \u0438 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u043e\u0442\u0441\u0442\u0443\u043f\u043b\u0435\u043d\u0438\u0435"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import gc",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 67
},
{
"cell_type": "code",
"collapsed": false,
"input": "gc.collect()",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "pyout",
"prompt_number": 68,
"text": "411"
}
],
"prompt_number": 68
},
{
"cell_type": "code",
"collapsed": false,
"input": "gc.garbage",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "pyout",
"prompt_number": 69,
"text": "[<__main__.Account at 0x10269c350>,\n <__main__.AccountObserver at 0x10269c7d0>,\n <__main__.Account at 0x10269cdd0>,\n <__main__.AccountObserver at 0x10269cd90>,\n <__main__.Account at 0x1026a61d0>,\n <__main__.AccountObserver at 0x1026a6190>,\n <__main__.AccountObserver at 0x1026988d0>,\n <__main__.Account at 0x102698910>]"
}
],
"prompt_number": 69
},
{
"cell_type": "code",
"collapsed": false,
"input": "class Node(object):\n parent = None\n\n def __init__(self, *children):\n self.children = list(children)\n for node in self.children:\n node.parent = self\n\n @classmethod\n def tree(cls, depth=1, numchildren=1):\n if depth == 0:\n return []\n return [cls(*cls.tree(depth-1, numchildren)) for _ in range(numchildren)]",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 70
},
{
"cell_type": "code",
"collapsed": false,
"input": "import gc\n\ndef gc_cb(phase, info):\n if not info['collected'] and not info['uncollectable']:\n return\n print(\"{0}:\\t{1[generation]}\\t{1[collected]}\\t{1[uncollectable]}\".format(\n phase, info))\n\ngc.callbacks.append(gc_cb)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 71
},
{
"cell_type": "code",
"collapsed": false,
"input": "# \u0411\u0443\u0434\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u043e 9330 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 1 \u043f\u0440\u043e\u0445\u043e\u0434\nfor n in range(20):\n for _ in range(n):\n Node.tree(depth=5, numchildren=6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "stop:\t0\t464\t0\nstop:\t1\t4665\t0"
},
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"stream": "stdout",
"text": "\nstop:\t2\t79305\t0"
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"text": "\nstop:\t1\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t2\t79305\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t2\t107295\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t2\t74640\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t2\t79305\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\n"
}
],
"prompt_number": 72
},
{
"cell_type": "markdown",
"metadata": {},
"source": "weakref"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import weakref\n\nclass WeakNode(Node):\n parent = None\n\n def __init__(self, *children):\n self.children = list(children)\n for node in self.children:\n node.parent = weakref.proxy(self)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 73
},
{
"cell_type": "code",
"collapsed": false,
"input": "class WeakNode(Node):\n _parent = None\n\n def __init__(self, *children):\n self.children = list(children)\n for node in self.children:\n node._parent = weakref.ref(self)\n\n @property\n def parent(self):\n if self._parent is None:\n return None\n else:\n return self._parent()",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 74
},
{
"cell_type": "code",
"collapsed": false,
"input": "# \u0411\u0443\u0434\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u043e 9330 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 1 \u043f\u0440\u043e\u0445\u043e\u0434\nfor n in range(20):\n for _ in range(n):\n WeakNode.tree(depth=5, numchildren=6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "stop:\t0\t458\t0\nstop:\t2\t27990\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\n"
}
],
"prompt_number": 75
},
{
"cell_type": "code",
"collapsed": false,
"input": "gc.set_threshold(10000, 100, 100)\n#gc.set_threshold(10000, 10, 10)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 76
},
{
"cell_type": "code",
"collapsed": false,
"input": "# \u0411\u0443\u0434\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u043e 9330 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 1 \u043f\u0440\u043e\u0445\u043e\u0434\nfor n in range(20):\n for _ in range(n):\n Node.tree(depth=5, numchildren=6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "stop:\t0\t34\t0\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t881685\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t909675\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t900345\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t909675\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t1\t900345\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\nstop:\t0\t9330\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0"
},
{
"output_type": "stream",
"stream": "stdout",
"text": "\nstop:\t0\t4665\t0\n"
}
],
"prompt_number": 77
},
{
"cell_type": "code",
"collapsed": false,
"input": "import weakref\n\nclass AccountObserver(object):\n def __init__(self, account):\n self.account_ref = weakref.ref(account)\n account.register(self)\n \n def __del__(self):\n account = self.account_ref()\n if account:\n self.account.unregister(self)\n \n def update(self):\n print(\"Balance: %0.2f\" % self.account.balance)\n \n def close(self):\n print(\"Observer disconnected\")",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 78
},
{
"cell_type": "code",
"collapsed": false,
"input": "a = Account(\"two\", 20.00)\na_ob = AccountObserver(a)",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 79
},
{
"cell_type": "code",
"collapsed": false,
"input": "import gc",
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 80
},
{
"cell_type": "code",
"collapsed": false,
"input": "gc.garbage",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "pyout",
"prompt_number": 81,
"text": "[<__main__.Account at 0x10269c350>,\n <__main__.AccountObserver at 0x10269c7d0>,\n <__main__.Account at 0x10269cdd0>,\n <__main__.AccountObserver at 0x10269cd90>,\n <__main__.Account at 0x1026a61d0>,\n <__main__.AccountObserver at 0x1026a6190>,\n <__main__.AccountObserver at 0x1026988d0>,\n <__main__.Account at 0x102698910>]"
}
],
"prompt_number": 81
},
{
"cell_type": "markdown",
"metadata": {},
"source": "\u0418\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c:\n\n* [\u0423\u0434\u0430\u043b\u0435\u043d\u0438\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u0441\u0431\u043e\u0440\u0449\u0438\u043a\u043e\u043c \u043c\u0443\u0441\u043e\u0440\u0430 - \u0431\u043b\u043e\u0433 \u0410\u043d\u0434\u0440\u0435\u044f \u0421\u0432\u0435\u0442\u043b\u043e\u0432\u0430](http://asvetlov.blogspot.ru/2013/05/gc.html)\n* [\u0423\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0443\u0442\u0435\u0447\u0435\u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0438 \u043d\u0430 \u041f\u0438\u0442\u043e\u043d\u0435 - \u0441\u0442\u0430\u0442\u044c\u044f \u043d\u0430 \u0445\u0430\u0431\u0440\u0435](http://habrahabr.ru/post/178637/)\n* \u0414\u044d\u0432\u0438\u0434 \u0411\u0438\u0437\u043b\u0438 - Python. \u041f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u0441\u043f\u0440\u0430\u0432\u043e\u0447\u043d\u0438\u043a\n* [weakref docs v3.4a](http://docs.python.org/3.4/library/weakref.html)\n* [gc docs v3.4a](http://docs.python.org/3.4/library/gc.html)"
}
],
"metadata": {}
}
]
}
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