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     "start_time": "2022-08-12T12:14:28.923089Z"
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    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import json\n",
    "import numpy as np"
   ]
  },
  {
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   "execution_count": 14,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2022-08-12T12:21:00.003395Z",
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   "source": [
    "dict_ = {'a': 3.1, 'b': 4.2}\n",
    "with open('my_class.json', 'w') as f:\n",
    "    json.dump(dict_, f)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "ExecuteTime": {
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     "start_time": "2022-08-12T12:23:03.883050Z"
    },
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   "outputs": [],
   "source": [
    "class MyClass:\n",
    "    \n",
    "    def __init__(self, a, b):\n",
    "        \"\"\"The basic constructor takes 'raw' values.\"\"\"\n",
    "        self.a = a\n",
    "        self.b = b\n",
    "        \n",
    "    @classmethod\n",
    "    def from_random_values(cls, random_state=np.random):\n",
    "        \"\"\"Create a MyClass instance with random parameters.\"\"\"\n",
    "        a = random_state.rand()\n",
    "        b = random_state.randn()\n",
    "        return cls(a, b)\n",
    "    \n",
    "    @classmethod\n",
    "    def from_json(cls, json_fname):\n",
    "        \"\"\"Create a MyClass instance with parameters read form a json file.\"\"\"\n",
    "        with open(json_fname, 'r') as f:\n",
    "            dict_ = json.load(f)\n",
    "        a = dict_['a']\n",
    "        b = dict_['b']\n",
    "        return cls(a, b)\n",
    "\n",
    "my_class = MyClass.from_random_values()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2022-08-12T12:23:12.242599Z",
     "start_time": "2022-08-12T12:23:12.237477Z"
    },
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'a': 0.842940228048758, 'b': 0.2797222990193814}"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "my_class = MyClass.from_random_values()\n",
    "my_class.__dict__"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2022-08-12T12:23:44.439726Z",
     "start_time": "2022-08-12T12:23:44.432540Z"
    },
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'a': 3.1, 'b': 4.2}"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "my_class = MyClass.from_json('my_class.json')\n",
    "my_class.__dict__"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": []
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   "execution_count": null,
   "metadata": {
    "collapsed": true
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   "source": []
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