find_max_digit.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import string\n",
    "import re\n",
    "import random"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def generate_data(length=300000):\n",
    "    data = []\n",
    "    for x in range(length):\n",
    "        sample = []\n",
    "        strings_count = random.randint(1, 6)\n",
    "        digit_position = random.randint(0, strings_count - 1)\n",
    "    \n",
    "        for i in range(strings_count):\n",
    "            sample.append(''.join(random.sample(string.ascii_letters, 10)))\n",
    "        sample[digit_position] = str(random.randint(1, 9999))\n",
    "    \n",
    "        data.append('/'.join(sample))\n",
    "    return data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "key = lambda x: int(re.search(r'\\d+', x).group(0))\n",
    "def f1(a):\n",
    "    return max(a,  key=key)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "translation = str.maketrans(string.digits, string.digits, string.ascii_letters + string.punctuation)\n",
    "def f2(a):\n",
    "    return max([int(i.translate(translation)) for i in a])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "data = generate_data()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Wall time: 679 ms\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'9999/dcCQDVPNvj/oSbdChQWly/PATiXgfdQo/YhRMFakrNg/sJAujfmKIW'"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "%time f1(data)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Wall time: 387 ms\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "9999"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "%time f2(data)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.5.0"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}