2024-heraklion-scientific-patterns/code_snippets/factory_methods.ipynb

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    "import json\n",
    "import numpy as np"
   ]
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    "dict_ = {'a': 3.1, 'b': 4.2}\n",
    "with open('my_class.json', 'w') as f:\n",
    "    json.dump(dict_, f)"
   ]
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    "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()"
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       "{'a': 0.842940228048758, 'b': 0.2797222990193814}"
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     "execution_count": 23,
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   "source": [
    "my_class = MyClass.from_random_values()\n",
    "my_class.__dict__"
   ]
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       "{'a': 3.1, 'b': 4.2}"
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     "execution_count": 24,
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   "source": [
    "my_class = MyClass.from_json('my_class.json')\n",
    "my_class.__dict__"
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