wrapper_test.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "from time import time"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [],
   "source": [
    "# decorators\n",
    "def timer(func):\n",
    "    # *args, **kwargs supports all function types\n",
    "    # n1, n2 = 100 for only for add and sub functions\n",
    "    def fn(*args, **kwargs):\n",
    "        start = time()\n",
    "        rv = func(*args, **kwargs)\n",
    "        end = time()\n",
    "        debug = True\n",
    "        if debug:\n",
    "            print('ellapsed:', end - start)\n",
    "        return rv\n",
    "    return fn"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 69,
   "metadata": {},
   "outputs": [],
   "source": [
    "# higher order decorators\n",
    "def log(debug):\n",
    "    def inner(f):\n",
    "        def wrapper(*args, **kwargs):\n",
    "            if debug:\n",
    "                print('inside {.__name__}'.format(f))\n",
    "            rv = f(*args, **kwargs)\n",
    "            return rv\n",
    "        return wrapper\n",
    "    return inner"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 72,
   "metadata": {},
   "outputs": [],
   "source": [
    "@timer\n",
    "@log(True)\n",
    "def add(n1, n2 = 100):\n",
    "    return n1 + n2\n",
    "\n",
    "# @time is similar to add = timer(add) statement"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 75,
   "metadata": {},
   "outputs": [],
   "source": [
    "@log(True)\n",
    "def sub(n1, n2 = 10):\n",
    "    return n1 - n2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 76,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "inside add\n",
      "ellapsed: 5.3882598876953125e-05\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "110"
      ]
     },
     "execution_count": 76,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "add(10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 77,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "inside add\n",
      "ellapsed: 0.00016427040100097656\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 77,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "add(1, 2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 78,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "inside sub\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "90"
      ]
     },
     "execution_count": 78,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sub(100)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 79,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "inside sub\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "-9"
      ]
     },
     "execution_count": 79,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sub(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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