sample.ipnb

{
 "metadata": {
  "name": "",
  "signature": "sha256:093e4d7561eebe0a00236a799d36efc6bdc0dd00e7517505b7ab14026324aef7"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import random\n",
      "import string\n",
      "from dis import dis\n",
      "\n",
      "def funa(app_id):\n",
      "    parts = app_id.split('com.tinycorp.')\n",
      "    if parts[0] == '' and len(parts) > 1:\n",
      "        return parts[1]\n",
      "    else:\n",
      "        return app_id\n",
      "\n",
      "def funb(str_in, preamble=None):\n",
      "    return str_in if not str_in.startswith(preamble) else str_in[len(preamble):]\n",
      "\n",
      "mfn_list = ['{}{}'.format('com.tinycorp.' if random.randint(0,1) else '', ''.join(random.sample(string.letters, 5))) for i in xrange(10000)]\n",
      "\n",
      "print \"first version run time\"\n",
      "%time _ = [funa(ml) for ml in mfn_list]\n",
      "print \"second version run time\"\n",
      "%time _ = [funb(ml, 'com.tinycorp.') for ml in mfn_list]\n",
      "\n",
      "print \"function a disassembled\"\n",
      "dis(funa)\n",
      "\n",
      "print \"function b disassembled\"\n",
      "dis(funb)\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "first version run time\n",
        "CPU times: user 4.42 ms, sys: 0 ns, total: 4.42 ms\n",
        "Wall time: 4.44 ms\n",
        "second version run time\n",
        "CPU times: user 4.01 ms, sys: 0 ns, total: 4.01 ms\n",
        "Wall time: 3.95 ms\n",
        "function a disassembled\n",
        "  6           0 LOAD_FAST                0 (app_id)\n",
        "              3 LOAD_ATTR                0 (split)\n",
        "              6 LOAD_CONST               1 ('com.tinycorp.')\n",
        "              9 CALL_FUNCTION            1\n",
        "             12 STORE_FAST               1 (parts)\n",
        "\n",
        "  7          15 LOAD_FAST                1 (parts)\n",
        "             18 LOAD_CONST               2 (0)\n",
        "             21 BINARY_SUBSCR       \n",
        "             22 LOAD_CONST               3 ('')\n",
        "             25 COMPARE_OP               2 (==)\n",
        "             28 POP_JUMP_IF_FALSE       57\n",
        "             31 LOAD_GLOBAL              1 (len)\n",
        "             34 LOAD_FAST                1 (parts)\n",
        "             37 CALL_FUNCTION            1\n",
        "             40 LOAD_CONST               4 (1)\n",
        "             43 COMPARE_OP               4 (>)\n",
        "             46 POP_JUMP_IF_FALSE       57\n",
        "\n",
        "  8          49 LOAD_FAST                1 (parts)\n",
        "             52 LOAD_CONST               4 (1)\n",
        "             55 BINARY_SUBSCR       \n",
        "             56 RETURN_VALUE        \n",
        "\n",
        " 10     >>   57 LOAD_FAST                0 (app_id)\n",
        "             60 RETURN_VALUE        \n",
        "             61 LOAD_CONST               0 (None)\n",
        "             64 RETURN_VALUE        \n",
        "function b disassembled\n",
        " 13           0 LOAD_FAST                0 (str_in)\n",
        "              3 LOAD_ATTR                0 (startswith)\n",
        "              6 LOAD_FAST                1 (preamble)\n",
        "              9 CALL_FUNCTION            1\n",
        "             12 POP_JUMP_IF_TRUE        19\n",
        "             15 LOAD_FAST                0 (str_in)\n",
        "             18 RETURN_VALUE        \n",
        "        >>   19 LOAD_FAST                0 (str_in)\n",
        "             22 LOAD_GLOBAL              1 (len)\n",
        "             25 LOAD_FAST                1 (preamble)\n",
        "             28 CALL_FUNCTION            1\n",
        "             31 SLICE+1             \n",
        "             32 RETURN_VALUE        \n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}