pd_sample.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 63,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "<div>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>name</th>\n",
       "      <th>size</th>\n",
       "      <th>year</th>\n",
       "      <th>sum</th>\n",
       "      <th>hoge</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>hoge</td>\n",
       "      <td>1</td>\n",
       "      <td>20</td>\n",
       "      <td>4</td>\n",
       "      <td>0.25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>fuga</td>\n",
       "      <td>2</td>\n",
       "      <td>30</td>\n",
       "      <td>2</td>\n",
       "      <td>1.00</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>piyo</td>\n",
       "      <td>3</td>\n",
       "      <td>20</td>\n",
       "      <td>4</td>\n",
       "      <td>0.75</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "   name  size  year  sum  hoge\n",
       "0  hoge     1    20    4  0.25\n",
       "1  fuga     2    30    2  1.00\n",
       "2  piyo     3    20    4  0.75"
      ]
     },
     "execution_count": 63,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import pandas as pd\n",
    "\n",
    "df = pd.DataFrame({'name': ['hoge', 'fuga', 'piyo'], 'size': [1, 2, 3], 'year': [20, 30, 20]})\n",
    "sum = df.groupby('year')['size'].transform('sum')\n",
    "df2 = df.copy()\n",
    "df2['sum'] = sum\n",
    "df2['hoge'] = df2['size'] / df2['sum']\n",
    "df2"
   ]
  }
 ],
 "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": "3.6.0"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}