{
 "cells": [
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "在 Polyglot Netebooks 中，添加Jupyter内核，支持Python语言\n",
    "=======================================================\n",
    "\n",
    "+ 前提：系统要安装Python环境，推荐使用Anaconda安装，直接安装Python也可以\n",
    "\n",
    "+ 作用：使多语言笔记，直接支持 Python语言；\n",
    "\n",
    "+ 优势：在一个笔记文档中，可以同时混合多种语言：Python、C#、F#、PowerShell、JS、SQL、HTML等"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 安装 Python\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "+ 直接安装：[Python官网](https://www.python.org/) 下载安装即可；\n",
    "+ Anaconda：[Anaconda官网](https://www.anaconda.com/) 安装后要设置好默认环境;"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "``` cmd\n",
    "    # 保证：在命令行窗口，能直接执行下面命令\n",
    "    python --version\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 方式一：直接使用魔法命令`#!connect jupyter`\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "直接使用魔术命令： \n",
    "\n",
    "+ 无Conda环境：`#!connect jupyter --kernel-name pythonkernel --kernel-spec python3`\n",
    "+ 有Conda环境：`#!connect jupyter --kernel-name pythonkernel --conda-env base --kernel-spec python3`\n",
    "\n",
    "实测有缺点：\n",
    "+ 不能重复执行：重复执行会报错\n",
    "+ 连接字符串必须是真实字符串：不能是变量，不灵活；明文\"不安全\",比如演示环境\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [
    {
     "data": {
      "text/markdown": [
       "The `#!connect jupyter` feature is in preview. Please report any feedback or issues at https://github.com/dotnet/interactive/issues/new/choose."
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "Kernel added: #!pythonkernel"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "//命名空间\n",
    "using Microsoft.DotNet.Interactive;\n",
    "using Microsoft.DotNet.Interactive.Commands;\n",
    "\n",
    "//引入Python内核\n",
    "#!connect jupyter --kernel-name pythonkernel --kernel-spec python3"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 方式二：变通用法：在C#程序中，拼接好魔术命令`#!connect`，再发送给内核执行\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "此种方式是魔法命令的变型、优化版，本质原理一样，只是调用方式换成C#。\n",
    "优点：\n",
    "+ 多次执行，不报错；\n",
    "+ 魔法命令：可自由拼接(可使用配置文件、系统变量、共享变量等)，非常灵活；"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [],
   "source": [
    "using Microsoft.DotNet.Interactive;\n",
    "using Microsoft.DotNet.Interactive.Commands;\n",
    "\n",
    "//引入Python内核：使用C# 执行引入语句\n",
    "if(Kernel.Root.FindKernelByName(\"pythonkernel\") == null)\n",
    "{\n",
    "    //Console.WriteLine(\"正在导入Python内核....\");\n",
    "    var importPythonkernel = \"#!connect jupyter --kernel-name pythonkernel --kernel-spec python3\";\n",
    "    await Kernel.Root.SendAsync(new SubmitCode( importPythonkernel,  \"csharp\"));\n",
    "    //Console.WriteLine(\"Python内核导入完成\");\n",
    "}\n",
    "else \n",
    "{\n",
    "    //Console.WriteLine(\"Python内核已经导入\");\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 使用Python语言内核"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "+ 使用 #!pythonkernel 命令，切换到Python语言内核\n",
    "+ 单元格右下角，选择 `pythonkernel`内核 "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "polyglot_notebook": {
     "kernelName": "pythonkernel"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "你好，我是 Ployglot Notebooks 使用 Python语言内核，打印的内容！\n"
     ]
    }
   ],
   "source": [
    "# 明确指定内核：优先级高于 \"单元格选择的内核\"\n",
    "#!pythonkernel\n",
    "\n",
    "print(\"你好，我是 Ployglot Notebooks 使用 Python语言内核，打印的内容！\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "polyglot_notebook": {
     "kernelName": "pythonkernel"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "右下方选择Python内核\n"
     ]
    }
   ],
   "source": [
    "# 右下方选择 内核\n",
    "print(\"右下方选择Python内核\");"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "polyglot_notebook": {
     "kernelName": "pythonkernel"
    }
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": ".NET (C#)",
   "language": "C#",
   "name": ".net-csharp"
  },
  "language_info": {
   "name": "polyglot-notebook"
  },
  "orig_nbformat": 4,
  "polyglot_notebook": {
   "kernelInfo": {
    "defaultKernelName": "csharp",
    "items": [
     {
      "aliases": [],
      "name": "csharp"
     },
     {
      "aliases": [],
      "languageName": "python",
      "name": "pythonkernel"
     },
     {
      "aliases": [],
      "name": "razor"
     }
    ]
   }
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}