NLP100本ノック00-05.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 第1章：準備運動"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 00.文字列の逆順"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:11.855920Z",
     "start_time": "2017-06-09T04:25:11.849857Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def q00():\n",
    "    string = \"stressed\"\n",
    "    return list(reversed(string))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:12.269393Z",
     "start_time": "2017-06-09T04:25:12.265296Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "assert q00(), \"desserts\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 01. 「パタトクカシーー」"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:13.016422Z",
     "start_time": "2017-06-09T04:25:13.008446Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def q01():\n",
    "    string = \"パタトクカシーー\"\n",
    "    chars = [c for i, c in enumerate(string, start=1) if i in (1, 3, 5, 7)]\n",
    "    return \"\".join(chars)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:13.340412Z",
     "start_time": "2017-06-09T04:25:13.336288Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "assert q01(), \"パトカー\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 02. 「パトカー」＋「タクシー」＝「パタトクカシーー」"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:13.943490Z",
     "start_time": "2017-06-09T04:25:13.936597Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def q02():\n",
    "    string1 = \"パトカー\"\n",
    "    string2 = \"タクシー\"\n",
    "    return \"\".join([c1 + c2 for c1, c2 in zip(string1, string2)])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:14.205836Z",
     "start_time": "2017-06-09T04:25:14.201759Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "assert q02(), \"パタトクカシーー\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 03. 円周率"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:14.790748Z",
     "start_time": "2017-06-09T04:25:14.777150Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "symbols = (\",\", \".\")\n",
    "def delete_symbol(c):\n",
    "    for symbol in symbols:\n",
    "        c = c.replace(symbol, \"\")\n",
    "    return c\n",
    "    \n",
    "def q03():\n",
    "    sentence = \"Now I need a drink, alcoholic of course, after the heavy lectures involving quantum mechanics.\"\n",
    "    return [len(delete_symbol(word)) for word in sentence.split()]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:15.077034Z",
     "start_time": "2017-06-09T04:25:15.072288Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "assert q03(), [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 04. 元素記号"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:15.725014Z",
     "start_time": "2017-06-09T04:25:15.704742Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def q04():\n",
    "    sentence = \"Hi He Lied Because Boron Could Not Oxidize Fluorine. New Nations Might Also Sign Peace Security Clause. Arthur King Can.\"\n",
    "    word_position = {}\n",
    "    \n",
    "    symbol_deleted_sentence = delete_symbol(sentence)\n",
    "\n",
    "    for i, word in enumerate(symbol_deleted_sentence.split(), start=1):\n",
    "        if i in (1, 5, 6, 7, 8, 9, 15, 16, 19):\n",
    "            char = word[0]\n",
    "        else:\n",
    "            char = word[:2]\n",
    "        word_position[char] = i\n",
    "    return word_position"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:16.757877Z",
     "start_time": "2017-06-09T04:25:16.752537Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'H': 1, 'He': 2, 'Li': 3, 'Be': 4, 'B': 5, 'C': 6, 'N': 7, 'O': 8, 'F': 9, 'Ne': 10, 'Na': 11, 'Mi': 12, 'Al': 13, 'Si': 14, 'P': 15, 'S': 16, 'Cl': 17, 'Ar': 18, 'K': 19, 'Ca': 20}\n"
     ]
    }
   ],
   "source": [
    "print(q04())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 05. n-gram"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:18.374561Z",
     "start_time": "2017-06-09T04:25:18.368842Z"
    },
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def q05(words, n=2):\n",
    "    return [words[i:i+n] for i in range(len(words)-n+1)]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "ExecuteTime": {
     "end_time": "2017-06-09T04:25:18.751725Z",
     "start_time": "2017-06-09T04:25:18.745007Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['I ', ' a', 'am', 'm ', ' a', 'an', 'n ', ' N', 'NL', 'LP', 'Pe', 'er']\n",
      "[['I', 'am'], ['am', 'an'], ['an', 'NLPer']]\n"
     ]
    }
   ],
   "source": [
    "sentence = \"I am an NLPer\"\n",
    "print(q05(sentence))\n",
    "print(q05(sentence.split()))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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