decorators.ipynb

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   "source": [
    "# creating by hand\n",
    "def two():\n",
    "    return 2\n",
    "\n",
    "def plus_one(func):\n",
    "    def helper():\n",
    "        return func() + 1\n",
    "\n",
    "    return helper\n",
    "\n",
    "three = plus_one(two)\n",
    "assert three() == 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# annotation\n",
    "def plus_one(func):\n",
    "    def helper():\n",
    "        return func() + 1\n",
    "\n",
    "    return helper\n",
    "\n",
    "@plus_one\n",
    "def three():\n",
    "    return 2\n",
    "\n",
    "three = plus_one(two)\n",
    "assert three() == 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# parametrized decorator\n",
    "\n",
    "def verbose(silent=False):\n",
    "    def verbose_decorator(func):\n",
    "        def decorated():\n",
    "            if not silent:\n",
    "                print(f\"Before {func.__name__}\")\n",
    "            result = func()\n",
    "            if not silent:\n",
    "                print(f\"After {func.__name__}\")\n",
    "            return result\n",
    "        return decorated\n",
    "    return verbose_decorator\n",
    "\n",
    "@verbose(silent=False)\n",
    "def loud_hello():\n",
    "    return 'hello'\n",
    "\n",
    "@verbose()\n",
    "def also_loud_hello():\n",
    "    return 'hello'\n",
    "\n",
    "@verbose(silent=True)\n",
    "def silent_hello():\n",
    "    return 'hello'\n",
    "\n",
    "print(loud_hello())\n",
    "print(also_loud_hello())\n",
    "print(silent_hello())\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "# using arguments\n",
    "def log_args(func):\n",
    "    def decorated(*args, **kwargs):\n",
    "        print(f\"calling {func.__name__}({args}, {kwargs})\")\n",
    "        return func(*args, **kwargs)\n",
    "    \n",
    "    return decorated\n",
    "\n",
    "@log_args\n",
    "def hello(a, b):\n",
    "    return 'hello'\n",
    "\n",
    "print(hello(1, b=10))\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Task\n",
    "\n",
    "# create a time logging decorator\n",
    "\n",
    "@timer(verbose=True)\n",
    "def hello():\n",
    "    return \"hello\"\n",
    "\n",
    "hello()\n",
    "# prints: \"function hello took 5.92s\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Task\n",
    "\n",
    "# create a memoize decorator\n",
    "# Task\n",
    "\n",
    "# create a time logging decorator\n",
    "\n",
    "@memoize\n",
    "def rand():\n",
    "    return random.randint(100)\n",
    "\n",
    "assert rand() == rand()"
   ]
  }
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