timeit-funciones.ipynb

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     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Algunas veces querr\u00e1s tomar nota del tiempo promedio que toma ejecutar alguna funci\u00f3n. Seguramente ya sabes que puedes usar el m\u00f3dulo `timeit`, pero seguramente te encontrar\u00e1s unos cuantos inconvenientes..."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def test():\n",
      "    \"\"\"Stupid test function\"\"\"\n",
      "    L = []\n",
      "    for i in range(100):\n",
      "        L.append(i)\n",
      "\n",
      "import timeit\n",
      "timeit.timeit(\"test()\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "ename": "NameError",
       "evalue": "global name 'test' is not defined",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mNameError\u001b[0m                                 Traceback (most recent call last)",
        "\u001b[1;32m<ipython-input-1-60e1cbc15514>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mimport\u001b[0m \u001b[0mtimeit\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0mtimeit\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mtimeit\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"test()\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[1;32m/usr/lib/python2.7/timeit.pyc\u001b[0m in \u001b[0;36mtimeit\u001b[1;34m(stmt, setup, timer, number)\u001b[0m\n\u001b[0;32m    228\u001b[0m            number=default_number):\n\u001b[0;32m    229\u001b[0m     \u001b[1;34m\"\"\"Convenience function to create Timer object and call timeit method.\"\"\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 230\u001b[1;33m     \u001b[1;32mreturn\u001b[0m \u001b[0mTimer\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mstmt\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0msetup\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mtimer\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mtimeit\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mnumber\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    231\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    232\u001b[0m def repeat(stmt=\"pass\", setup=\"pass\", timer=default_timer,\n",
        "\u001b[1;32m/usr/lib/python2.7/timeit.pyc\u001b[0m in \u001b[0;36mtimeit\u001b[1;34m(self, number)\u001b[0m\n\u001b[0;32m    193\u001b[0m         \u001b[0mgc\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mdisable\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    194\u001b[0m         \u001b[1;32mtry\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m--> 195\u001b[1;33m             \u001b[0mtiming\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0minner\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mit\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mself\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mtimer\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m    196\u001b[0m         \u001b[1;32mfinally\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m    197\u001b[0m             \u001b[1;32mif\u001b[0m \u001b[0mgcold\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
        "\u001b[1;32m/usr/lib/python2.7/timeit.pyc\u001b[0m in \u001b[0;36minner\u001b[1;34m(_it, _timer)\u001b[0m\n",
        "\u001b[1;31mNameError\u001b[0m: global name 'test' is not defined"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "El nombre global 'test' no est\u00e1 definido. Y s\u00ed, tiene raz\u00f3n. De hecho la [documentaci\u00f3n de timeit](https://docs.python.org/3.3/library/timeit.html) dice que debes utilizar el par\u00e1metro `setup` para ello. Aunque la verdad prefiero algo m\u00e1s sencillo y directo (en este tipo de casos):"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "timeit.timeit(lambda: test())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 2,
       "text": [
        "9.818758010864258"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Y s\u00ed, tambi\u00e9n funciona con par\u00e1metros"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import calendar\n",
      "import random\n",
      "def daysinyear(year):\n",
      "    \"\"\" Returns how many days has the year \"\"\"\n",
      "    return 366 if calendar.isleap(year) else 365\n",
      "\n",
      "year = random.randint(1900, 2014)\n",
      "\n",
      "timeit.timeit(lambda: daysinyear(year))\n",
      "    "
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 3,
       "text": [
        "0.46839189529418945"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Sencillo, \u00bfno?\n",
      "\n",
      "******\n",
      "Por [Espartaco Palma][espartaweb] ([@esparta][espartwitter])\n",
      "\n",
      "![Licencia Creative Commons][ccimage]\n",
      "\n",
      "Este obra est\u00e1 bajo [Licencia Creative Commons Atribuci\u00f3n 4.0 Internacional][cc].\n",
      "\n",
      "[espartwitter]: https://twitter.com/esparta/\n",
      "[espartaweb]: http://esparta.co\n",
      "[ccimage]: https://i.creativecommons.org/l/by/4.0/88x31.png \"Licencia Creative Commons\"\n",
      "[cc]: https://creativecommons.org/licenses/by/4.0/"
     ]
    }
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