Day76-90/code/4-pandas多层索引.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "\n",
    "import pandas as pd\n",
    "# 数据分析BI-------->人工智能AI\n",
    "# 数据分析和数据挖掘一个意思，\n",
    "# 工具和软件：Excel 免费版\n",
    "# SPSS（一人一年10000）、SAS（一人一年5000）、Matlab 收费\n",
    "# R、Python（全方位语言，流行） 免费\n",
    "# Python + numpy + scipy + pandas + matplotlib + seaborn + pyEcharts + sklearn + kereas（Tensorflow）+…… \n",
    "# 代码，自动化（数据输入----输出结果）\n",
    "from pandas import Series,DataFrame"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "a     63\n",
       "b    107\n",
       "c     16\n",
       "d     35\n",
       "e    140\n",
       "f     83\n",
       "dtype: int32"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 多层索引，行列\n",
    "# 单层索引\n",
    "s = Series(np.random.randint(0,150,size = 6),index=list('abcdef'))\n",
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "张三  期中    114\n",
       "    期末    131\n",
       "李四  期中      3\n",
       "    期末     63\n",
       "王五  期中    107\n",
       "    期末     34\n",
       "dtype: int32"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 多层索引，两层，三层以上（规则一样）\n",
    "s2 = Series(np.random.randint(0,150,size = 6),index = pd.MultiIndex.from_product([['张三','李四','王五'],['期中','期末']]))\n",
    "s2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "scrolled": true
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   "outputs": [
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th>Python</th>\n",
       "      <th>En</th>\n",
       "      <th>Math</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">张三</th>\n",
       "      <th>期中</th>\n",
       "      <td>73</td>\n",
       "      <td>5</td>\n",
       "      <td>25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>37</td>\n",
       "      <td>36</td>\n",
       "      <td>56</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">李四</th>\n",
       "      <th>期中</th>\n",
       "      <td>149</td>\n",
       "      <td>81</td>\n",
       "      <td>142</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>71</td>\n",
       "      <td>138</td>\n",
       "      <td>0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">王五</th>\n",
       "      <th>期中</th>\n",
       "      <td>11</td>\n",
       "      <td>94</td>\n",
       "      <td>103</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>25</td>\n",
       "      <td>121</td>\n",
       "      <td>83</td>\n",
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      "text/plain": [
       "       Python   En  Math\n",
       "张三 期中      73    5    25\n",
       "   期末      37   36    56\n",
       "李四 期中     149   81   142\n",
       "   期末      71  138     0\n",
       "王五 期中      11   94   103\n",
       "   期末      25  121    83"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df = DataFrame(np.random.randint(0,150,size = (6,3)),columns=['Python','En','Math'],index =pd.MultiIndex.from_product([['张三','李四','王五'],['期中','期末']]) )\n",
    "\n",
    "df"
   ]
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  {
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   "execution_count": 5,
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       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th rowspan=\"4\" valign=\"top\">张三</th>\n",
       "      <th rowspan=\"2\" valign=\"top\">期中</th>\n",
       "      <th>A</th>\n",
       "      <td>15</td>\n",
       "      <td>31</td>\n",
       "      <td>17</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>82</td>\n",
       "      <td>56</td>\n",
       "      <td>123</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">期末</th>\n",
       "      <th>A</th>\n",
       "      <td>14</td>\n",
       "      <td>2</td>\n",
       "      <td>78</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>69</td>\n",
       "      <td>50</td>\n",
       "      <td>17</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"4\" valign=\"top\">李四</th>\n",
       "      <th rowspan=\"2\" valign=\"top\">期中</th>\n",
       "      <th>A</th>\n",
       "      <td>91</td>\n",
       "      <td>87</td>\n",
       "      <td>143</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>120</td>\n",
       "      <td>118</td>\n",
       "      <td>39</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">期末</th>\n",
       "      <th>A</th>\n",
       "      <td>56</td>\n",
       "      <td>76</td>\n",
       "      <td>55</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>11</td>\n",
       "      <td>105</td>\n",
       "      <td>121</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"4\" valign=\"top\">王五</th>\n",
       "      <th rowspan=\"2\" valign=\"top\">期中</th>\n",
       "      <th>A</th>\n",
       "      <td>147</td>\n",
       "      <td>78</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>128</td>\n",
       "      <td>126</td>\n",
       "      <td>146</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">期末</th>\n",
       "      <th>A</th>\n",
       "      <td>49</td>\n",
       "      <td>45</td>\n",
       "      <td>114</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <td>121</td>\n",
       "      <td>26</td>\n",
       "      <td>77</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
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      ],
      "text/plain": [
       "         Python   En  Math\n",
       "张三 期中 A      15   31    17\n",
       "      B      82   56   123\n",
       "   期末 A      14    2    78\n",
       "      B      69   50    17\n",
       "李四 期中 A      91   87   143\n",
       "      B     120  118    39\n",
       "   期末 A      56   76    55\n",
       "      B      11  105   121\n",
       "王五 期中 A     147   78     1\n",
       "      B     128  126   146\n",
       "   期末 A      49   45   114\n",
       "      B     121   26    77"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 三层索引\n",
    "df3 = DataFrame(np.random.randint(0,150,size = (12,3)),columns=['Python','En','Math'],index =pd.MultiIndex.from_product([['张三','李四','王五'],['期中','期末'],['A','B']]) )\n",
    "\n",
    "df3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "73"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 先获取列后获取行\n",
    "df['Python']['张三']['期中']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [],
   "source": [
    "df2 = df.copy()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
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       "      <th rowspan=\"2\" valign=\"top\">张三</th>\n",
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       "      <td>73</td>\n",
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       "      <td>25</td>\n",
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       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>37</td>\n",
       "      <td>36</td>\n",
       "      <td>56</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">李四</th>\n",
       "      <th>期中</th>\n",
       "      <td>149</td>\n",
       "      <td>81</td>\n",
       "      <td>142</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>71</td>\n",
       "      <td>138</td>\n",
       "      <td>0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">王五</th>\n",
       "      <th>期中</th>\n",
       "      <td>11</td>\n",
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       "      <td>103</td>\n",
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       "    <tr>\n",
       "      <th>期末</th>\n",
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       "       Python   En  Math\n",
       "张三 期中      73    5    25\n",
       "   期末      37   36    56\n",
       "李四 期中     149   81   142\n",
       "   期末      71  138     0\n",
       "王五 期中      11   94   103\n",
       "   期末      25  121    83"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
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   ],
   "source": [
    "df2.sort_index()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {
    "scrolled": true
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "73"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 先获取行，后获取列\n",
    "df.loc['张三'].loc['期中']['Python']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
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       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">张三</th>\n",
       "      <th>期中</th>\n",
       "      <td>73</td>\n",
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       "      <td>25</td>\n",
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       "    <tr>\n",
       "      <th>期末</th>\n",
       "      <td>37</td>\n",
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      "text/plain": [
       "       Python  En  Math\n",
       "张三 期中      73   5    25\n",
       "   期末      37  36    56"
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    "df.iloc[[0,1]]"
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