store_attr_vs_getattr.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from fastcore.basics import store_attr"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [],
   "source": [
    "class A:\n",
    "    aa = 4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "class B:\n",
    "    def __init__(self, a, b=3, c=5):\n",
    "        store_attr()\n",
    "        self.a_obj = A()\n",
    "\n",
    "    def __getattr__(self, attr):\n",
    "        return getattr(self.a_obj, attr)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "ename": "RecursionError",
     "evalue": "maximum recursion depth exceeded",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mRecursionError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[1;32mUntitled-1.ipynb Cell 4\u001b[0m in \u001b[0;36m<cell line: 1>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=0'>1</a>\u001b[0m b \u001b[39m=\u001b[39m B(\u001b[39m1\u001b[39;49m)\n",
      "\u001b[1;32mUntitled-1.ipynb Cell 4\u001b[0m in \u001b[0;36mB.__init__\u001b[0;34m(self, a, b, c)\u001b[0m\n\u001b[1;32m      <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=1'>2</a>\u001b[0m \u001b[39mdef\u001b[39;00m \u001b[39m__init__\u001b[39m(\u001b[39mself\u001b[39m, a, b\u001b[39m=\u001b[39m\u001b[39m3\u001b[39m, c\u001b[39m=\u001b[39m\u001b[39m5\u001b[39m):\n\u001b[0;32m----> <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=2'>3</a>\u001b[0m     store_attr()\n\u001b[1;32m      <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=3'>4</a>\u001b[0m     \u001b[39mself\u001b[39m\u001b[39m.\u001b[39ma_obj \u001b[39m=\u001b[39m A()\n",
      "File \u001b[0;32m~/mambaforge/envs/py310/lib/python3.10/site-packages/fastcore/basics.py:399\u001b[0m, in \u001b[0;36mstore_attr\u001b[0;34m(names, self, but, cast, store_args, **attrs)\u001b[0m\n\u001b[1;32m    397\u001b[0m \u001b[39mif\u001b[39;00m \u001b[39mself\u001b[39m: args \u001b[39m=\u001b[39m (\u001b[39m'\u001b[39m\u001b[39mself\u001b[39m\u001b[39m'\u001b[39m, \u001b[39m*\u001b[39margs)\n\u001b[1;32m    398\u001b[0m \u001b[39melse\u001b[39;00m: \u001b[39mself\u001b[39m \u001b[39m=\u001b[39m fr\u001b[39m.\u001b[39mf_locals[args[\u001b[39m0\u001b[39m]]\n\u001b[0;32m--> 399\u001b[0m \u001b[39mif\u001b[39;00m store_args \u001b[39mis\u001b[39;00m \u001b[39mNone\u001b[39;00m: store_args \u001b[39m=\u001b[39m \u001b[39mnot\u001b[39;00m \u001b[39mhasattr\u001b[39;49m(\u001b[39mself\u001b[39;49m,\u001b[39m'\u001b[39;49m\u001b[39m__slots__\u001b[39;49m\u001b[39m'\u001b[39;49m)\n\u001b[1;32m    400\u001b[0m \u001b[39mif\u001b[39;00m store_args \u001b[39mand\u001b[39;00m \u001b[39mnot\u001b[39;00m \u001b[39mhasattr\u001b[39m(\u001b[39mself\u001b[39m, \u001b[39m'\u001b[39m\u001b[39m__stored_args__\u001b[39m\u001b[39m'\u001b[39m): \u001b[39mself\u001b[39m\u001b[39m.\u001b[39m__stored_args__ \u001b[39m=\u001b[39m {}\n\u001b[1;32m    401\u001b[0m anno \u001b[39m=\u001b[39m annotations(\u001b[39mself\u001b[39m) \u001b[39mif\u001b[39;00m cast \u001b[39melse\u001b[39;00m {}\n",
      "\u001b[1;32mUntitled-1.ipynb Cell 4\u001b[0m in \u001b[0;36mB.__getattr__\u001b[0;34m(self, attr)\u001b[0m\n\u001b[1;32m      <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=5'>6</a>\u001b[0m \u001b[39mdef\u001b[39;00m \u001b[39m__getattr__\u001b[39m(\u001b[39mself\u001b[39m, attr):\n\u001b[0;32m----> <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=6'>7</a>\u001b[0m     \u001b[39mreturn\u001b[39;00m \u001b[39mgetattr\u001b[39m(\u001b[39mself\u001b[39;49m\u001b[39m.\u001b[39;49ma_obj, attr)\n",
      "\u001b[1;32mUntitled-1.ipynb Cell 4\u001b[0m in \u001b[0;36mB.__getattr__\u001b[0;34m(self, attr)\u001b[0m\n\u001b[1;32m      <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=5'>6</a>\u001b[0m \u001b[39mdef\u001b[39;00m \u001b[39m__getattr__\u001b[39m(\u001b[39mself\u001b[39m, attr):\n\u001b[0;32m----> <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=6'>7</a>\u001b[0m     \u001b[39mreturn\u001b[39;00m \u001b[39mgetattr\u001b[39m(\u001b[39mself\u001b[39;49m\u001b[39m.\u001b[39;49ma_obj, attr)\n",
      "    \u001b[0;31m[... skipping similar frames: B.__getattr__ at line 7 (2966 times)]\u001b[0m\n",
      "\u001b[1;32mUntitled-1.ipynb Cell 4\u001b[0m in \u001b[0;36mB.__getattr__\u001b[0;34m(self, attr)\u001b[0m\n\u001b[1;32m      <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=5'>6</a>\u001b[0m \u001b[39mdef\u001b[39;00m \u001b[39m__getattr__\u001b[39m(\u001b[39mself\u001b[39m, attr):\n\u001b[0;32m----> <a href='vscode-notebook-cell:Untitled-1.ipynb?jupyter-notebook#W3sdW50aXRsZWQ%3D?line=6'>7</a>\u001b[0m     \u001b[39mreturn\u001b[39;00m \u001b[39mgetattr\u001b[39m(\u001b[39mself\u001b[39;49m\u001b[39m.\u001b[39;49ma_obj, attr)\n",
      "\u001b[0;31mRecursionError\u001b[0m: maximum recursion depth exceeded"
     ]
    }
   ],
   "source": [
    "b = B(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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