mutable-hasattr.ipynb

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   "source": [
    "class C:\n",
    "    def __init__(self):\n",
    "        self._c = 0\n",
    "    @property\n",
    "    def count(self):\n",
    "        self._c += 1\n",
    "        return self._c"
   ]
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   "source": [
    "CC = C()"
   ]
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   "source": [
    "CC.count"
   ]
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     "execution_count": 4,
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    "CC.count"
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    "CC._c"
   ]
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  {
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   "execution_count": 6,
   "metadata": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "hasattr(CC, 'count')\n",
    "hasattr(CC, 'count')\n",
    "hasattr(CC, 'count')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "5"
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     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "CC._c"
   ]
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