From 527d3b655a1fafc676f98b26e012c6140fd75048 Mon Sep 17 00:00:00 2001
From: 100gle <569590461@qq.com>
Date: Sat, 19 Nov 2022 11:21:53 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=96=B0=E5=A2=9E=E6=8A=80=E8=83=BD?=
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---
 code/newsletter/N6/method_chaining.ipynb | 351 +++++++++++++++++++++++
 1 file changed, 351 insertions(+)
 create mode 100644 code/newsletter/N6/method_chaining.ipynb

diff --git a/code/newsletter/N6/method_chaining.ipynb b/code/newsletter/N6/method_chaining.ipynb
new file mode 100644
index 0000000..b98d209
--- /dev/null
+++ b/code/newsletter/N6/method_chaining.ipynb
@@ -0,0 +1,351 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "source": [
+    "# 链式调用示例"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
+   "outputs": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "outputs": [
+    {
+     "data": {
+      "text/plain": "        date\n0 2022-01-02\n1 2022-01-09\n2 2022-01-16\n3 2022-01-23\n4 2022-01-30",
+      "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>date</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>0</th>\n      <td>2022-01-02</td>\n    </tr>\n    <tr>\n      <th>1</th>\n      <td>2022-01-09</td>\n    </tr>\n    <tr>\n      <th>2</th>\n      <td>2022-01-16</td>\n    </tr>\n    <tr>\n      <th>3</th>\n      <td>2022-01-23</td>\n    </tr>\n    <tr>\n      <th>4</th>\n      <td>2022-01-30</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import pandas as pd\n",
+    "\n",
+    "data = pd.DataFrame(dict(date=pd.date_range(\"20220101\", \"20220201\", freq=\"1W\")))\n",
+    "data.head()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "outputs": [
+    {
+     "data": {
+      "text/plain": "         date  year month day year_month\n0  2022-01-02  2022    01  02     202201\n1  2022-01-09  2022    01  09     202201\n2  2022-01-16  2022    01  16     202201\n3  2022-01-23  2022    01  23     202201\n4  2022-01-30  2022    01  30     202201",
+      "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>date</th>\n      <th>year</th>\n      <th>month</th>\n      <th>day</th>\n      <th>year_month</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>0</th>\n      <td>2022-01-02</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>02</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>1</th>\n      <td>2022-01-09</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>09</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>2</th>\n      <td>2022-01-16</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>16</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>3</th>\n      <td>2022-01-23</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>23</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>4</th>\n      <td>2022-01-30</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>30</td>\n      <td>202201</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "data[\"date\"] = data[\"date\"].astype(str)\n",
+    "data[\"year\"] = data[\"date\"].map(lambda s: s.split(\"-\")[0])\n",
+    "data[\"month\"] = data[\"date\"].map(lambda s: s.split(\"-\")[1])\n",
+    "data[\"day\"] = data[\"date\"].map(lambda s: s.split(\"-\")[2])\n",
+    "data[\"year_month\"] = data[\"year\"].str.cat(data[\"month\"])\n",
+    "data.head()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "## 第一种重构方式"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "source": [
+    "data = (\n",
+    "    pd.DataFrame({\"date\": pd.date_range(\"20220101\", \"20220201\", freq=\"1W\")})\n",
+    "    .astype({\"date\": \"str\"})[\"date\"]\n",
+    "    .str.split(\"-\", expand=True)\n",
+    "    .rename(\n",
+    "        columns={\n",
+    "            0: \"year\",\n",
+    "            1: \"month\",\n",
+    "            2: \"day\",\n",
+    "        }\n",
+    "    )\n",
+    "    .assign(\n",
+    "        date=lambda df: df.apply(lambda r: \"-\".join(r.tolist()), axis=1),\n",
+    "        year_month=lambda df: df[\"year\"].str.cat(df[\"month\"]),\n",
+    "    )\n",
+    ")\n",
+    "data.head()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
+   "execution_count": 4,
+   "outputs": [
+    {
+     "data": {
+      "text/plain": "   year month day        date year_month\n0  2022    01  02  2022-01-02     202201\n1  2022    01  09  2022-01-09     202201\n2  2022    01  16  2022-01-16     202201\n3  2022    01  23  2022-01-23     202201\n4  2022    01  30  2022-01-30     202201",
+      "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>year</th>\n      <th>month</th>\n      <th>day</th>\n      <th>date</th>\n      <th>year_month</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>0</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>02</td>\n      <td>2022-01-02</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>1</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>09</td>\n      <td>2022-01-09</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>2</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>16</td>\n      <td>2022-01-16</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>3</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>23</td>\n      <td>2022-01-23</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>4</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>30</td>\n      <td>2022-01-30</td>\n      <td>202201</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "## 第二种重构方式"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "outputs": [
+    {
+     "data": {
+      "text/plain": "   year month day        date year_month\n0  2022    01  02  2022-01-02     202201\n1  2022    01  09  2022-01-09     202201\n2  2022    01  16  2022-01-16     202201\n3  2022    01  23  2022-01-23     202201\n4  2022    01  30  2022-01-30     202201",
+      "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>year</th>\n      <th>month</th>\n      <th>day</th>\n      <th>date</th>\n      <th>year_month</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>0</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>02</td>\n      <td>2022-01-02</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>1</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>09</td>\n      <td>2022-01-09</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>2</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>16</td>\n      <td>2022-01-16</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>3</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>23</td>\n      <td>2022-01-23</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>4</th>\n      <td>2022</td>\n      <td>01</td>\n      <td>30</td>\n      <td>2022-01-30</td>\n      <td>202201</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "data = (\n",
+    "    pd.DataFrame({\"date\": pd.date_range(\"20220101\", \"20220201\", freq=\"1W\")})\n",
+    "    .astype({\"date\": \"str\"})[\"date\"]\n",
+    "    .str.extract(r\"(?P<year>\\d{4})-(?P<month>\\d{2})-(?P<day>\\d{2})\")\n",
+    "    .assign(\n",
+    "        date=lambda df: df.apply(lambda row: \"-\".join(row.tolist()), axis=1),\n",
+    "        year_month=lambda df: df[\"year\"].str.cat(df[\"month\"]),\n",
+    "    )\n",
+    ")\n",
+    "\n",
+    "data.head()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "## 第三种重构方式"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "outputs": [
+    {
+     "data": {
+      "text/plain": "         date  year month day year_month\n0  2022-01-02  2022    01  02     202201\n1  2022-01-09  2022    01  09     202201\n2  2022-01-16  2022    01  16     202201\n3  2022-01-23  2022    01  23     202201\n4  2022-01-30  2022    01  30     202201",
+      "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>date</th>\n      <th>year</th>\n      <th>month</th>\n      <th>day</th>\n      <th>year_month</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>0</th>\n      <td>2022-01-02</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>02</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>1</th>\n      <td>2022-01-09</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>09</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>2</th>\n      <td>2022-01-16</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>16</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>3</th>\n      <td>2022-01-23</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>23</td>\n      <td>202201</td>\n    </tr>\n    <tr>\n      <th>4</th>\n      <td>2022-01-30</td>\n      <td>2022</td>\n      <td>01</td>\n      <td>30</td>\n      <td>202201</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "data = (\n",
+    "    pd.DataFrame({\"date\": pd.date_range(\"20220101\", \"20220201\", freq=\"1W\")})\n",
+    "    .assign(\n",
+    "        year=lambda df: df[\"date\"].dt.year,\n",
+    "        month=lambda df: df[\"date\"].dt.month.astype(str).str.zfill(2),\n",
+    "        day=lambda df: df[\"date\"].dt.day.astype(str).str.zfill(2),\n",
+    "        year_month=lambda df: df[\"date\"].dt.strftime(\"%Y%m\"),\n",
+    "    )\n",
+    "    .astype(str)\n",
+    ")\n",
+    "data.head()"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "# 链式调用的实现原理以及优劣"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "outputs": [],
+   "source": [
+    "class Command:\n",
+    "    def __init__(self, name=None):\n",
+    "        self.name = name\n",
+    "\n",
+    "    def set_options(self, **kwargs):\n",
+    "        for k, v in kwargs.items():\n",
+    "            if not hasattr(self, k):\n",
+    "                setattr(self, k, v)\n",
+    "        return self\n",
+    "\n",
+    "    def parse(self):\n",
+    "        opts = [f\"{v}\" for k, v in self.__dict__.items() if k != \"name\"]\n",
+    "        final = \" \".join([self.name, *opts])\n",
+    "        return final\n",
+    "\n",
+    "    def __repr__(self):\n",
+    "        opts = [f\"{k}={v}\" for k, v in self.__dict__.items() if k != \"name\"]\n",
+    "        return f\"Command<name: {self.name}, options[{', '.join(opts)}]>\""
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "outputs": [],
+   "source": [
+    "cmd = Command(\"curl\").set_options(verbose=\"-v\").set_options(target=\"sspai.com\")"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Command<name: curl, options[verbose=-v, target=sspai.com]>\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(cmd)"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "curl -v sspai.com\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(cmd.parse())"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   }
+  }
+ ],
+ "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
+}
\ No newline at end of file