class_1.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Pythonのデータ型"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "20210408を4328で割った余りを求めてみよう。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2976"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "20210408 % 4328"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2976"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "20210408 - int(20210408/4328) * 4328"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "文字列\"ab\"が10回続いた後\"cba\"が10回続く文字列を作れ。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'ababababababababababcbacbacbacbacbacbacbacbacbacba'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ab = 'ab'\n",
    "cba = 'cba'\n",
    "ab * 10 + cba * 10"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題3"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "文字列\"Madam, I'm Adam\"を逆順にしてみよう。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"madA m'I ,madaM\""
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "mad = \"Madam, I'm Adam\"\n",
    "mad[::-1]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題4"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "WARNINGという文字列を40文字幅の中央揃えにし、左右を!で埋めてみよう。 つまり、以下のように表示される。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'!!!!!!!!!!!!!!!!WARNING!!!!!!!!!!!!!!!!!'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "warning = \"WARNING\"\n",
    "(warning.center(40)).replace(' ','!')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Pythonの基礎1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "文字列\n",
    "\n",
    "'2,3,5,7,9,11,13,17'\n",
    "から要素を一つずつ取り出してリストにしてみよ。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['2', '3', '5', '7', '9', '11', '13', '17']"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "string1 = '2,3,5,7,9,11,13,17'\n",
    "string1.split(',')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 観察"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "オフセットは対象とするリストの中で有効なものでなければならない。 先頭より前、または末尾よりも後ろのオフセットを指定すると例外が起きる。 それを確認してみよ。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-7-d00386573199>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mGAFA\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;34m'Google'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'Apple'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'Facebook'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'Amazon'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mGAFA\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m10\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "GAFA = ['Google', 'Apple', 'Facebook', 'Amazon']\n",
    "GAFA[10]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-8-ba4f6b907e4b>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mGAFA\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;33m-\u001b[0m\u001b[1;36m10\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "GAFA[-10]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "リストfruitsの要素を逆順に取り出してみよう。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['grape', 'orange', 'apple']"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits[::-1]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 観察"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "extend()ではなくappend()でothersを追加するとどうなるか確認してみよう。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'orange', 'grape', 'banana', 'pear']"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "others = ['banana', 'pear']\n",
    "fruits.extend(others)\n",
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'orange', 'grape', 'banana', 'pear']"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits += others\n",
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'orange', 'grape', ['banana', 'pear']]"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits.append(others)\n",
    "fruits"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 観察"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "末尾を超えるオフセットに要素を挿入しようとするとどうなるか確認せよ。 また、先頭に要素を追加したい場合はオフセットはいくつを指定すればよいか。 負の数をインデックスに指定した場合はどうか。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'orange', 'grape', 'pear']"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits.insert(5, 'pear')\n",
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['pear', 'apple', 'orange', 'grape']"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits.insert(0, 'pear')\n",
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'orange', 'pear', 'grape']"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits = ['apple', 'orange', 'grape']\n",
    "fruits.insert(-1, 'pear')\n",
    "fruits"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 観察"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "同じ要素を複数回含むリストに対し、その要素の位置をindex()で求めた場合どうなるか。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "str2 = ['a', 'b', 'c', 'a', 'a']\n",
    "str2.index('a')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "str2.index('b')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "str2.append('b')\n",
    "str2\n",
    "str2.index('b')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 観察"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "文字列と数値の混じったリストをソートしたらどうなるか確認せよ。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'<' not supported between instances of 'int' and 'str'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-26-9bf84935ca87>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mnum\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;34m'0'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'2'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m'3'\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m4\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mnum\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0msort\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: '<' not supported between instances of 'int' and 'str'"
     ]
    }
   ],
   "source": [
    "num = ['0', 1, '2', '3', 4]\n",
    "num.sort()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題4"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "以下のように果物の個数を表す辞書を作ってみよう。\n",
    "　リンゴ: 3個\n",
    "　オレンジ: 2個\n",
    "　梨: 4個"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'apple': 3, 'orange': 2, 'pear': 4}"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "lot = [['apple', 3], ['orange', 2], ['pear', 4]]\n",
    "dic = dict(lot)\n",
    "dic"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題5"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "練習問題4の果物の数において、リンゴを1つ食べ、ブドウを3つ購入した。 この時の果物の個数を表す辞書を（元の辞書から）更新してみよう。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'apple': 2, 'orange': 2, 'pear': 4, 'grape': 3}"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dic['apple'] = 2\n",
    "dic['grape'] = 3\n",
    "dic"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 練習問題6"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "ウォッカがあって、クリームとベルモットがないものを選ぶ先ほどのサンプルを積集合演算子を使って書き直してみよ。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'martini': {'vermouth', 'vodka'},\n",
       " 'black russian': {'kahlua', 'vodka'},\n",
       " 'white russain': {'cream', 'kahlua', 'vodka'},\n",
       " 'manhattan': {'bitters', 'rye', 'vermouth'},\n",
       " 'screwdriver': {'orange juice', 'vodka'}}"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "drinks = {\n",
    "    'martini': {'vodka', 'vermouth'},\n",
    "    'black russian': {'vodka', 'kahlua'},\n",
    "    'white russain': {'cream', 'kahlua', 'vodka'},\n",
    "    'manhattan': {'rye', 'vermouth', 'bitters'},\n",
    "    'screwdriver': {'orange juice', 'vodka'}\n",
    "    }\n",
    "drinks"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "black russian\n",
      "screwdriver\n"
     ]
    }
   ],
   "source": [
    "for name, contents in drinks.items():\n",
    "    if contents & {'vodka',} and not contents & {'cream', 'vermouth'}:\n",
    "        print(name)"
   ]
  }
 ],
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