lec25-テキストデータの読み書き.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "from pandas import Series,DataFrame\n",
    "import pandas as pd"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>q</th>\n",
       "      <th>r</th>\n",
       "      <th>s</th>\n",
       "      <th>t</th>\n",
       "      <th>apple</th>\n",
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       "      <th>0</th>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>pear</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>a</td>\n",
       "      <td>s</td>\n",
       "      <td>d</td>\n",
       "      <td>f</td>\n",
       "      <td>rabbit</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>5</td>\n",
       "      <td>2</td>\n",
       "      <td>5</td>\n",
       "      <td>7</td>\n",
       "      <td>dog</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
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      "text/plain": [
       "   q  r  s  t   apple\n",
       "0  2  3  4  5    pear\n",
       "1  a  s  d  f  rabbit\n",
       "2  5  2  5  7     dog"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# csv読み込んでDataFrameにする\n",
    "dframe = pd.read_csv('lec25.csv')\n",
    "dframe"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
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       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
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       "      <td>apple</td>\n",
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       "      <td>2</td>\n",
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       "      <td>pear</td>\n",
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       "      <td>a</td>\n",
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      "text/plain": [
       "   0  1  2  3       4\n",
       "0  q  r  s  t   apple\n",
       "1  2  3  4  5    pear\n",
       "2  a  s  d  f  rabbit\n",
       "3  5  2  5  7     dog"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "# 1行目を列名にしない場合\n",
    "dframe = pd.read_csv('lec25.csv',header=None)\n",
    "dframe"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
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       "      <td>q</td>\n",
       "      <td>r</td>\n",
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       "      <td>apple</td>\n",
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       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>pear</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>a</td>\n",
       "      <td>s</td>\n",
       "      <td>d</td>\n",
       "      <td>f</td>\n",
       "      <td>rabbit</td>\n",
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       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>5</td>\n",
       "      <td>2</td>\n",
       "      <td>5</td>\n",
       "      <td>7</td>\n",
       "      <td>dog</td>\n",
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      "text/plain": [
       "   0  1  2  3       4\n",
       "0  q  r  s  t   apple\n",
       "1  2  3  4  5    pear\n",
       "2  a  s  d  f  rabbit\n",
       "3  5  2  5  7     dog"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# read_tableというメソッドでも同様\n",
    "ddframe = pd.read_table('lec25.csv',sep=',',header=None)\n",
    "dframe"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
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       "      <th>4</th>\n",
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       "      <td>q</td>\n",
       "      <td>r</td>\n",
       "      <td>s</td>\n",
       "      <td>t</td>\n",
       "      <td>apple</td>\n",
       "    </tr>\n",
       "    <tr>\n",
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       "      <td>2</td>\n",
       "      <td>3</td>\n",
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       "      <td>pear</td>\n",
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      "text/plain": [
       "   0  1  2  3      4\n",
       "0  q  r  s  t  apple\n",
       "1  2  3  4  5   pear"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "# 読み込む行数を指定\n",
    "pd.read_csv('lec25.csv',header=None,nrows=2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
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       "      <td>q</td>\n",
       "      <td>r</td>\n",
       "      <td>s</td>\n",
       "      <td>t</td>\n",
       "      <td>apple</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "      <td>5</td>\n",
       "      <td>pear</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>a</td>\n",
       "      <td>s</td>\n",
       "      <td>d</td>\n",
       "      <td>f</td>\n",
       "      <td>rabbit</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>5</td>\n",
       "      <td>2</td>\n",
       "      <td>5</td>\n",
       "      <td>7</td>\n",
       "      <td>dog</td>\n",
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      "text/plain": [
       "   0  1  2  3       4\n",
       "0  q  r  s  t   apple\n",
       "1  2  3  4  5    pear\n",
       "2  a  s  d  f  rabbit\n",
       "3  5  2  5  7     dog"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dframe"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      ",0,1,2,3,4\r\n",
      "0,q,r,s,t,apple\r\n",
      "1,2,3,4,5,pear\r\n",
      "2,a,s,d,f,rabbit\r\n",
      "3,5,2,5,7,dog\r\n"
     ]
    }
   ],
   "source": [
    "# 保存\n",
    "dframe.to_csv('mytextdata_out.csv')\n",
    "!cat mytextdata_out.csv"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "_0_1_2_3_4\n",
      "0_q_r_s_t_apple\n",
      "1_2_3_4_5_pear\n",
      "2_a_s_d_f_rabbit\n",
      "3_5_2_5_7_dog\n"
     ]
    }
   ],
   "source": [
    "import sys\n",
    "dframe.to_csv(sys.stdout, sep='_')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      ",0,1,2\n",
      "0,q,r,s\n",
      "1,2,3,4\n",
      "2,a,s,d\n",
      "3,5,2,5\n"
     ]
    }
   ],
   "source": [
    "# 出力する列を選択\n",
    "dframe.to_csv(sys.stdout,columns=[0,1,2])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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