Lec018.ipynb

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   "source": [
    "import numpy as np\n",
    "from pandas import Series, DataFrame\n",
    "import pandas as pd"
   ]
  },
  {
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   "execution_count": 2,
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    {
     "data": {
      "text/plain": [
       "a    0\n",
       "b    1\n",
       "c    2\n",
       "dtype: int64"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "ser1 = Series(np.arange(3), index=['a', 'b', 'c'])\n",
    "ser1"
   ]
  },
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   "cell_type": "code",
   "execution_count": 3,
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    {
     "data": {
      "text/plain": [
       "a    0\n",
       "c    2\n",
       "dtype: int64"
      ]
     },
     "execution_count": 3,
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   ],
   "source": [
    "# indexを消すにはdropを使う\n",
    "ser1.drop('b')"
   ]
  },
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       "<div>\n",
       "<style scoped>\n",
       "    .dataframe tbody tr th:only-of-type {\n",
       "        vertical-align: middle;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: right;\n",
       "    }\n",
       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pop</th>\n",
       "      <th>size</th>\n",
       "      <th>year</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>SF</th>\n",
       "      <td>0</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>LA</th>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>NY</th>\n",
       "      <td>6</td>\n",
       "      <td>7</td>\n",
       "      <td>8</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
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      "text/plain": [
       "    pop  size  year\n",
       "SF    0     1     2\n",
       "LA    3     4     5\n",
       "NY    6     7     8"
      ]
     },
     "execution_count": 4,
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   ],
   "source": [
    "# DataFrameの場合\n",
    "dframe1 = DataFrame(np.arange(9).reshape((3, 3)),\n",
    "                    index=['SF', 'LA', 'NY'],\n",
    "                    columns=['pop', 'size', 'year'])\n",
    "dframe1"
   ]
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   "cell_type": "code",
   "execution_count": 8,
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       "<div>\n",
       "<style scoped>\n",
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pop</th>\n",
       "      <th>size</th>\n",
       "      <th>year</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>SF</th>\n",
       "      <td>0</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>NY</th>\n",
       "      <td>6</td>\n",
       "      <td>7</td>\n",
       "      <td>8</td>\n",
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      "text/plain": [
       "    pop  size  year\n",
       "SF    0     1     2\n",
       "NY    6     7     8"
      ]
     },
     "execution_count": 8,
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   "source": [
    "# indexを指定して、行を削除\n",
    "\n",
    "dframe1.drop('LA') #, axis=0が省略されている"
   ]
  },
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pop</th>\n",
       "      <th>size</th>\n",
       "      <th>year</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>SF</th>\n",
       "      <td>0</td>\n",
       "      <td>1</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>LA</th>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>NY</th>\n",
       "      <td>6</td>\n",
       "      <td>7</td>\n",
       "      <td>8</td>\n",
       "    </tr>\n",
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      "text/plain": [
       "    pop  size  year\n",
       "SF    0     1     2\n",
       "LA    3     4     5\n",
       "NY    6     7     8"
      ]
     },
     "execution_count": 6,
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   ],
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    "dframe1"
   ]
  },
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   "execution_count": 7,
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    {
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>pop</th>\n",
       "      <th>size</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>SF</th>\n",
       "      <td>0</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>LA</th>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>NY</th>\n",
       "      <td>6</td>\n",
       "      <td>7</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
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      "text/plain": [
       "    pop  size\n",
       "SF    0     1\n",
       "LA    3     4\n",
       "NY    6     7"
      ]
     },
     "execution_count": 7,
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   "source": [
    "# 列（カラム）を削除することも可能です。\n",
    "# その場合、列の軸を示す、axis=1が必要\n",
    "\n",
    "dframe1.drop('year', axis=1)"
   ]
  }
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