Execution order of decorators.ipynb

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 "metadata": {
  "name": "Execution order of decorators"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def deco_a(func):\n",
      "    def wrapper(*args, **kwargs):\n",
      "        print \"decoration a running\"\n",
      "        return func(*args, **kwargs)\n",
      "    return wrapper\n",
      "\n",
      "def deco_b(func):\n",
      "    def wrapper(*args, **kwargs):\n",
      "        print \"decoration b running\"\n",
      "        return func(*args, **kwargs)\n",
      "    return wrapper"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "@deco_a\n",
      "@deco_b\n",
      "def func():\n",
      "    print 'f called'\n",
      "\n",
      "func()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "decoration a running\n",
        "decoration b running\n",
        "f called\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import time\n",
      "\n",
      "def wait(func):\n",
      "    def wrapper(*args, **kwargs):\n",
      "        print 'waiting'\n",
      "        time.sleep(2)\n",
      "        return func(*args, **kwargs)\n",
      "    return wrapper\n",
      "\n",
      "@wait\n",
      "@deco_a\n",
      "def func():\n",
      "    print 'f called'\n",
      "\n",
      "func()\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "waiting\n",
        "decoration a running"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "f called\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "func()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "waiting\n",
        "decoration a running"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "f called\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def deco_a(func):\n",
      "    def wrapper(*args, **kwargs):\n",
      "        result = func(*args, **kwargs)\n",
      "        print \"decoration a running\"\n",
      "        return result\n",
      "    return wrapper\n",
      "\n",
      "def deco_b(func):\n",
      "    def wrapper(*args, **kwargs):\n",
      "        result =  func(*args, **kwargs)\n",
      "        print \"decoration b running\"\n",
      "        return result\n",
      "    return wrapper"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "@deco_a\n",
      "@deco_b\n",
      "def func():\n",
      "    print 'f called'\n",
      "func()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "f called\n",
        "decoration b running\n",
        "decoration a running\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}