From bc94d5ca29ffca988ee11d077c5df0cd7370806e Mon Sep 17 00:00:00 2001
From: 100gle <569590461@qq.com>
Date: Wed, 25 May 2022 22:41:49 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=96=B0=E5=A2=9EVol11=E7=AB=A0?=
 =?UTF-8?q?=E8=8A=82=E7=A4=BA=E4=BE=8B=E6=BA=90=E7=A0=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 code/11/dataframe.ipynb | 2048 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 2048 insertions(+)
 create mode 100644 code/11/dataframe.ipynb

diff --git a/code/11/dataframe.ipynb b/code/11/dataframe.ipynb
new file mode 100644
index 0000000..3b795a1
--- /dev/null
+++ b/code/11/dataframe.ipynb
@@ -0,0 +1,2048 @@
+{
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": true,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "# 什么是 DataFrame？"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 112,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>name</th>\n",
+              "      <th>age</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>Alice</td>\n",
+              "      <td>10</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>Bob</td>\n",
+              "      <td>20</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>Carol</td>\n",
+              "      <td>30</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "    name  age\n",
+              "0  Alice   10\n",
+              "1    Bob   20\n",
+              "2  Carol   30"
+            ]
+          },
+          "execution_count": 112,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "import pandas as pd\n",
+        "\n",
+        "data = dict(\n",
+        "    name=[\"Alice\", \"Bob\", \"Carol\"],\n",
+        "    age=[10, 20, 30],\n",
+        ")\n",
+        "df = pd.DataFrame(data)\n",
+        "df"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 113,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "name": "stdout",
+          "output_type": "stream",
+          "text": [
+            "<class 'pandas.core.frame.DataFrame'>\n",
+            "RangeIndex: 3 entries, 0 to 2\n",
+            "Data columns (total 2 columns):\n",
+            " #   Column  Non-Null Count  Dtype \n",
+            "---  ------  --------------  ----- \n",
+            " 0   name    3 non-null      object\n",
+            " 1   age     3 non-null      int64 \n",
+            "dtypes: int64(1), object(1)\n",
+            "memory usage: 176.0+ bytes\n"
+          ]
+        }
+      ],
+      "source": [
+        "df.info()"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 114,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "0    Alice\n",
+              "1      Bob\n",
+              "2    Carol\n",
+              "Name: name, dtype: object"
+            ]
+          },
+          "execution_count": 114,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df[\"name\"] # 1"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 115,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "pandas.core.series.Series"
+            ]
+          },
+          "execution_count": 115,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "type(df[\"name\"])"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "# 常用的 DataFrame 属性"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 116,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "RangeIndex(start=0, stop=3, step=1)"
+            ]
+          },
+          "execution_count": 116,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.index"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 117,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "name    object\n",
+              "age      int64\n",
+              "dtype: object"
+            ]
+          },
+          "execution_count": 117,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.dtypes"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 118,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "(3, 2)"
+            ]
+          },
+          "execution_count": 118,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.shape"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 119,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "6"
+            ]
+          },
+          "execution_count": 119,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.size"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 120,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "array([['Alice', 10],\n",
+              "       ['Bob', 20],\n",
+              "       ['Carol', 30]], dtype=object)"
+            ]
+          },
+          "execution_count": 120,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.values"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 121,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "Index(['name', 'age'], dtype='object')"
+            ]
+          },
+          "execution_count": 121,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.columns"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 122,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "[RangeIndex(start=0, stop=3, step=1), Index(['name', 'age'], dtype='object')]"
+            ]
+          },
+          "execution_count": 122,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.axes"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 123,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "2"
+            ]
+          },
+          "execution_count": 123,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "df.ndim"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 124,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "name": "stdout",
+          "output_type": "stream",
+          "text": [
+            "df is not empty\n"
+          ]
+        }
+      ],
+      "source": [
+        "if df.empty:\n",
+        "    print(\"df is empty\")\n",
+        "else:\n",
+        "    print(\"df is not empty\")"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "# 常用的 DataFrame 方法"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "## 查看数据信息"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 125,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "name": "stdout",
+          "output_type": "stream",
+          "text": [
+            "<class 'pandas.core.frame.DataFrame'>\n",
+            "RangeIndex: 3 entries, 0 to 2\n",
+            "Data columns (total 2 columns):\n",
+            " #   Column  Non-Null Count  Dtype \n",
+            "---  ------  --------------  ----- \n",
+            " 0   name    3 non-null      object\n",
+            " 1   age     3 non-null      int64 \n",
+            "dtypes: int64(1), object(1)\n",
+            "memory usage: 176.0+ bytes\n"
+          ]
+        }
+      ],
+      "source": [
+        "df.info()"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "example："
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 126,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>88</td>\n",
+              "      <td>69</td>\n",
+              "      <td>31</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>81</td>\n",
+              "      <td>87</td>\n",
+              "      <td>40</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>23</td>\n",
+              "      <td>18</td>\n",
+              "      <td>15</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>68</td>\n",
+              "      <td>52</td>\n",
+              "      <td>89</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>30</td>\n",
+              "      <td>90</td>\n",
+              "      <td>73</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>...</th>\n",
+              "      <td>...</td>\n",
+              "      <td>...</td>\n",
+              "      <td>...</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>95</th>\n",
+              "      <td>95</td>\n",
+              "      <td>4</td>\n",
+              "      <td>8</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>96</th>\n",
+              "      <td>93</td>\n",
+              "      <td>14</td>\n",
+              "      <td>1</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>97</th>\n",
+              "      <td>18</td>\n",
+              "      <td>91</td>\n",
+              "      <td>63</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>98</th>\n",
+              "      <td>27</td>\n",
+              "      <td>31</td>\n",
+              "      <td>62</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>99</th>\n",
+              "      <td>63</td>\n",
+              "      <td>73</td>\n",
+              "      <td>85</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "<p>100 rows × 3 columns</p>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "     a   b   c\n",
+              "0   88  69  31\n",
+              "1   81  87  40\n",
+              "2   23  18  15\n",
+              "3   68  52  89\n",
+              "4   30  90  73\n",
+              "..  ..  ..  ..\n",
+              "95  95   4   8\n",
+              "96  93  14   1\n",
+              "97  18  91  63\n",
+              "98  27  31  62\n",
+              "99  63  73  85\n",
+              "\n",
+              "[100 rows x 3 columns]"
+            ]
+          },
+          "execution_count": 126,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "import random\n",
+        "\n",
+        "import pandas as pd\n",
+        "\n",
+        "random.seed(233)\n",
+        "\n",
+        "data = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "        \"b\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "        \"c\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "    }\n",
+        ")\n",
+        "data"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 127,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>88</td>\n",
+              "      <td>69</td>\n",
+              "      <td>31</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>81</td>\n",
+              "      <td>87</td>\n",
+              "      <td>40</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>23</td>\n",
+              "      <td>18</td>\n",
+              "      <td>15</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>68</td>\n",
+              "      <td>52</td>\n",
+              "      <td>89</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>30</td>\n",
+              "      <td>90</td>\n",
+              "      <td>73</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "    a   b   c\n",
+              "0  88  69  31\n",
+              "1  81  87  40\n",
+              "2  23  18  15\n",
+              "3  68  52  89\n",
+              "4  30  90  73"
+            ]
+          },
+          "execution_count": 127,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.head()"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 128,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>95</th>\n",
+              "      <td>95</td>\n",
+              "      <td>4</td>\n",
+              "      <td>8</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>96</th>\n",
+              "      <td>93</td>\n",
+              "      <td>14</td>\n",
+              "      <td>1</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>97</th>\n",
+              "      <td>18</td>\n",
+              "      <td>91</td>\n",
+              "      <td>63</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>98</th>\n",
+              "      <td>27</td>\n",
+              "      <td>31</td>\n",
+              "      <td>62</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>99</th>\n",
+              "      <td>63</td>\n",
+              "      <td>73</td>\n",
+              "      <td>85</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "     a   b   c\n",
+              "95  95   4   8\n",
+              "96  93  14   1\n",
+              "97  18  91  63\n",
+              "98  27  31  62\n",
+              "99  63  73  85"
+            ]
+          },
+          "execution_count": 128,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.tail()"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "## 索引数据"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "### 列表式"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 129,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>88</td>\n",
+              "      <td>69</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>81</td>\n",
+              "      <td>87</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>2</th>\n",
+              "      <td>23</td>\n",
+              "      <td>18</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>3</th>\n",
+              "      <td>68</td>\n",
+              "      <td>52</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4</th>\n",
+              "      <td>30</td>\n",
+              "      <td>90</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "    a   b\n",
+              "0  88  69\n",
+              "1  81  87\n",
+              "2  23  18\n",
+              "3  68  52\n",
+              "4  30  90"
+            ]
+          },
+          "execution_count": 129,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "cols = [\"a\", \"b\"]\n",
+        "\n",
+        "filtered = data[cols]\n",
+        "filtered.head()"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "### 坐标式"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 130,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>RZOlH</th>\n",
+              "      <td>39</td>\n",
+              "      <td>76</td>\n",
+              "      <td>77</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oZ2EJ</th>\n",
+              "      <td>95</td>\n",
+              "      <td>41</td>\n",
+              "      <td>5</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>12</td>\n",
+              "      <td>75</td>\n",
+              "      <td>86</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oSTae</th>\n",
+              "      <td>4</td>\n",
+              "      <td>69</td>\n",
+              "      <td>61</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>7RpMT</th>\n",
+              "      <td>51</td>\n",
+              "      <td>75</td>\n",
+              "      <td>79</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a   b   c\n",
+              "RZOlH  39  76  77\n",
+              "oZ2EJ  95  41   5\n",
+              "nf1gr  12  75  86\n",
+              "oSTae   4  69  61\n",
+              "7RpMT  51  75  79"
+            ]
+          },
+          "execution_count": 130,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "import random\n",
+        "import string\n",
+        "\n",
+        "random.seed(233)\n",
+        "\n",
+        "\n",
+        "def make_labels(n):\n",
+        "    alphabet = string.ascii_letters\n",
+        "    number = string.digits\n",
+        "\n",
+        "    return [\"\".join(random.sample(alphabet + number, 5)) for _ in range(n)]\n",
+        "\n",
+        "\n",
+        "labels = make_labels(100)\n",
+        "\n",
+        "data = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "        \"b\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "        \"c\": [random.randrange(1, 100) for _ in range(100)],\n",
+        "    },\n",
+        "    index=labels,\n",
+        ")\n",
+        "data.head()"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 131,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "41"
+            ]
+          },
+          "execution_count": 131,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.at[\"oZ2EJ\", \"b\"]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 132,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/plain": [
+              "75"
+            ]
+          },
+          "execution_count": 132,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.iat[2, 1]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 133,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [],
+      "source": [
+        "# index error\n",
+        "# data.iat[\"oZ2EJ\", 1]"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "### 列表坐标式"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 134,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>12</td>\n",
+              "      <td>75</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oSTae</th>\n",
+              "      <td>4</td>\n",
+              "      <td>69</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a   b\n",
+              "nf1gr  12  75\n",
+              "oSTae   4  69"
+            ]
+          },
+          "execution_count": 134,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.loc[\"nf1gr\":\"oSTae\", \"a\":\"b\"]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 135,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>75</td>\n",
+              "      <td>86</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        b   c\n",
+              "nf1gr  75  86"
+            ]
+          },
+          "execution_count": 135,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.iloc[2:3, [1, 2]]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 136,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>RZOlH</th>\n",
+              "      <td>39</td>\n",
+              "      <td>76</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oZ2EJ</th>\n",
+              "      <td>95</td>\n",
+              "      <td>41</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>12</td>\n",
+              "      <td>75</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oSTae</th>\n",
+              "      <td>4</td>\n",
+              "      <td>69</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>7RpMT</th>\n",
+              "      <td>51</td>\n",
+              "      <td>75</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a   b\n",
+              "RZOlH  39  76\n",
+              "oZ2EJ  95  41\n",
+              "nf1gr  12  75\n",
+              "oSTae   4  69\n",
+              "7RpMT  51  75"
+            ]
+          },
+          "execution_count": 136,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.loc[:\"7RpMT\", :\"b\"]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 137,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>RZOlH</th>\n",
+              "      <td>39</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oZ2EJ</th>\n",
+              "      <td>95</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>12</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oSTae</th>\n",
+              "      <td>4</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>7RpMT</th>\n",
+              "      <td>51</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>...</th>\n",
+              "      <td>...</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>E14KY</th>\n",
+              "      <td>77</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>KDjSI</th>\n",
+              "      <td>79</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>tn75V</th>\n",
+              "      <td>85</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>4ITDH</th>\n",
+              "      <td>55</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>gxQwc</th>\n",
+              "      <td>30</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "<p>99 rows × 1 columns</p>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a\n",
+              "RZOlH  39\n",
+              "oZ2EJ  95\n",
+              "nf1gr  12\n",
+              "oSTae   4\n",
+              "7RpMT  51\n",
+              "...    ..\n",
+              "E14KY  77\n",
+              "KDjSI  79\n",
+              "tn75V  85\n",
+              "4ITDH  55\n",
+              "gxQwc  30\n",
+              "\n",
+              "[99 rows x 1 columns]"
+            ]
+          },
+          "execution_count": 137,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.iloc[:-1, 0:1]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 138,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>nf1gr</th>\n",
+              "      <td>12</td>\n",
+              "      <td>86</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oSTae</th>\n",
+              "      <td>4</td>\n",
+              "      <td>61</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>7RpMT</th>\n",
+              "      <td>51</td>\n",
+              "      <td>79</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a   c\n",
+              "nf1gr  12  86\n",
+              "oSTae   4  61\n",
+              "7RpMT  51  79"
+            ]
+          },
+          "execution_count": 138,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.loc[\"nf1gr\":\"7RpMT\", [\"a\", \"c\"]]"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 139,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>RZOlH</th>\n",
+              "      <td>39</td>\n",
+              "      <td>77</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>oZ2EJ</th>\n",
+              "      <td>95</td>\n",
+              "      <td>5</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "        a   c\n",
+              "RZOlH  39  77\n",
+              "oZ2EJ  95   5"
+            ]
+          },
+          "execution_count": 139,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data.iloc[[0, 1], [0, 2]]"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "\n",
+        "## 拼接数据"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "### append"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 140,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>A</td>\n",
+              "      <td>1</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>B</td>\n",
+              "      <td>2</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "   a  b\n",
+              "0  A  1\n",
+              "1  B  2"
+            ]
+          },
+          "execution_count": 140,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data1 = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [\"A\", \"B\"],\n",
+        "        \"b\": [1, 2],\n",
+        "    }\n",
+        ")\n",
+        "data1.head()"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 141,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>C</td>\n",
+              "      <td>3</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>D</td>\n",
+              "      <td>4</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "   a  b\n",
+              "0  C  3\n",
+              "1  D  4"
+            ]
+          },
+          "execution_count": 141,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data2 = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [\"C\", \"D\"],\n",
+        "        \"b\": [3, 4],\n",
+        "    }\n",
+        ")\n",
+        "data2.head()"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 142,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>A</td>\n",
+              "      <td>1</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>B</td>\n",
+              "      <td>2</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>C</td>\n",
+              "      <td>3</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>D</td>\n",
+              "      <td>4</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "   a  b\n",
+              "0  A  1\n",
+              "1  B  2\n",
+              "0  C  3\n",
+              "1  D  4"
+            ]
+          },
+          "execution_count": 142,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data1.append(data2)"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 143,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b</th>\n",
+              "      <th>c</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>A</td>\n",
+              "      <td>1.0</td>\n",
+              "      <td>NaN</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>B</td>\n",
+              "      <td>2.0</td>\n",
+              "      <td>NaN</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>C</td>\n",
+              "      <td>3.0</td>\n",
+              "      <td>NaN</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>D</td>\n",
+              "      <td>4.0</td>\n",
+              "      <td>NaN</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>E</td>\n",
+              "      <td>NaN</td>\n",
+              "      <td>5.0</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>F</td>\n",
+              "      <td>NaN</td>\n",
+              "      <td>6.0</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "   a    b    c\n",
+              "0  A  1.0  NaN\n",
+              "1  B  2.0  NaN\n",
+              "0  C  3.0  NaN\n",
+              "1  D  4.0  NaN\n",
+              "0  E  NaN  5.0\n",
+              "1  F  NaN  6.0"
+            ]
+          },
+          "execution_count": 143,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "data3 = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [\"E\", \"F\"],\n",
+        "        \"c\": [5, 6],\n",
+        "    }\n",
+        ")\n",
+        "\n",
+        "data1.append(data2).append(data3)"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%% md\n"
+        }
+      },
+      "source": [
+        "### merge"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": 144,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [
+        {
+          "data": {
+            "text/html": [
+              "<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>a</th>\n",
+              "      <th>b_x</th>\n",
+              "      <th>b_y</th>\n",
+              "    </tr>\n",
+              "  </thead>\n",
+              "  <tbody>\n",
+              "    <tr>\n",
+              "      <th>0</th>\n",
+              "      <td>1</td>\n",
+              "      <td>a</td>\n",
+              "      <td>c</td>\n",
+              "    </tr>\n",
+              "    <tr>\n",
+              "      <th>1</th>\n",
+              "      <td>2</td>\n",
+              "      <td>b</td>\n",
+              "      <td>d</td>\n",
+              "    </tr>\n",
+              "  </tbody>\n",
+              "</table>\n",
+              "</div>"
+            ],
+            "text/plain": [
+              "   a b_x b_y\n",
+              "0  1   a   c\n",
+              "1  2   b   d"
+            ]
+          },
+          "execution_count": 144,
+          "metadata": {},
+          "output_type": "execute_result"
+        }
+      ],
+      "source": [
+        "\n",
+        "data1 = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [1, 2],\n",
+        "        \"b\": [\"a\", \"b\"],\n",
+        "    }\n",
+        ")\n",
+        "\n",
+        "data2 = pd.DataFrame(\n",
+        "    {\n",
+        "        \"a\": [1, 2],\n",
+        "        \"b\": [\"c\", \"d\"],\n",
+        "    }\n",
+        ")\n",
+        "\n",
+        "data1.merge(data2, on=\"a\")"
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "metadata": {
+        "collapsed": false,
+        "pycharm": {
+          "name": "#%%\n"
+        }
+      },
+      "outputs": [],
+      "source": []
+    }
+  ],
+  "metadata": {
+    "kernelspec": {
+      "display_name": "Python 3",
+      "language": "python",
+      "name": "python3"
+    },
+    "language_info": {
+      "codemirror_mode": {
+        "name": "ipython",
+        "version": 2
+      },
+      "file_extension": ".py",
+      "mimetype": "text/x-python",
+      "name": "python",
+      "nbconvert_exporter": "python",
+      "pygments_lexer": "ipython2",
+      "version": "2.7.6"
+    }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 0
+}