python_reference/timeit_test.ipynb

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   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# Python benchmarks via `timeit`"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### String formatting - `.format()` vs. `%s`"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import timeit\n",
      "\n",
      "def test_format():\n",
      "    return ['{}'.format(i) for i in range(1000000)]\n",
      "\n",
      "def test_binaryop():\n",
      "    return ['%s' %i for i in range(1000000)]\n",
      "\n",
      "%timeit test_format()\n",
      "%timeit test_binaryop()\n",
      "\n",
      "#print('{}: {}\\n{}: {}'.format('format()', format_res, '%s', binaryop_res))\n",
      "\n",
      "################################\n",
      "# On my machine\n",
      "################################\n",
      "#\n",
      "# Python 3.4.0\n",
      "# MacOS X 10.9.2\n",
      "# 2.5 GHz Intel Core i5\n",
      "# 4 GB 1600 Mhz DDR3\n",
      "#"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1 loops, best of 3: 400 ms per loop\n",
        "1 loops, best of 3: 241 ms per loop"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### String Reversing - `[::-1]` vs. `''.join(reversed())`"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import timeit\n",
      "\n",
      "def reverse_join(my_str):\n",
      "    return ''.join(reversed(my_str))\n",
      "    \n",
      "def reverse_slizing(my_str):\n",
      "    return my_str[::-1]\n",
      "\n",
      "\n",
      "# Test to show that both work\n",
      "a = reverse_join('abcd')\n",
      "b = reverse_slizing('abcd')\n",
      "assert(a == b and a == 'dcba')\n",
      "\n",
      "%timeit reverse_join('abcd')\n",
      "%timeit reverse_slizing('abcd')\n",
      "\n",
      "# Python 3.4.0\n",
      "# MacOS X 10.9.2\n",
      "# 2.4 GHz Intel Core Duo\n",
      "# 8 GB 1067 Mhz DDR3\n",
      "#"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1000000 loops, best of 3: 1.28 \u00b5s per loop\n",
        "1000000 loops, best of 3: 337 ns per loop"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "### List Reversing - `[::-1]` vs. `reverse()` vs. `reversed()`"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import timeit\n",
      "\n",
      "def reverse_func(my_list):\n",
      "    new_list = my_list[:]\n",
      "    new_list.reverse()\n",
      "    return new_list\n",
      "    \n",
      "def reversed_func(my_list):\n",
      "    return list(reversed(my_list))\n",
      "\n",
      "def reverse_slizing(my_list):\n",
      "    return my_list[::-1]\n",
      "\n",
      "%timeit reverse_func([1,2,3,4,5])\n",
      "%timeit reversed_func([1,2,3,4,5])\n",
      "%timeit reverse_slizing([1,2,3,4,5])\n",
      "\n",
      "# Python 3.4.0\n",
      "# MacOS X 10.9.2\n",
      "# 2.4 GHz Intel Core Duo\n",
      "# 8 GB 1067 Mhz DDR3\n",
      "#"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1000000 loops, best of 3: 857 ns per loop\n",
        "1000000 loops, best of 3: 1.78 \u00b5s per loop"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n",
        "1000000 loops, best of 3: 758 ns per loop"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "\n"
       ]
      }
     ],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
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