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</a></span></div></div> <div data-v-7dd95ae2><div data-v-7dd95ae2><main class="page"><section style="display:;"><div class="page-title"><h1 class="title">第2天-安装Python</h1> <div data-v-8a445198><i class="iconfont reco-account" data-v-8a445198><span data-v-8a445198>哪吒</span></i> <i class="iconfont reco-date" data-v-8a445198><span data-v-8a445198>2023/6/15</span></i> <!----> <!----></div></div> <div class="theme-reco-content content__default"><h1 id="第2天-安装python"><a href="#第2天-安装python" class="header-anchor">#</a> 第2天-安装Python</h1> <h2 id="python的跨平台特性"><a href="#python的跨平台特性" class="header-anchor">#</a> Python的跨平台特性</h2> <p>因为Python是跨平台的，它可以运行在Windows、Mac和各种Linux/Unix系统上。在Windows上写Python程序，放到Linux上也是能够运行的。</p> <blockquote><p><strong>小白注解</strong>：跨平台意味着"一次编写，到处运行"，这是Python的一大优势。你不需要为不同的操作系统重写代码。</p></blockquote> <h2 id="安装python能得到什么"><a href="#安装python能得到什么" class="header-anchor">#</a> 安装Python能得到什么？</h2> <p>要开始学习Python编程，首先就得把Python安装到你的电脑里。安装后，你会得到：</p> <blockquote><p><strong>安装包含的组件</strong>：</p> <ul><li>🐍 <strong>Python解释器</strong>：负责运行Python程序的核心引擎</li> <li>💻 <strong>命令行交互环境</strong>：可以直接输入Python代码并立即看到结果</li> <li>🛠️ <strong>IDLE</strong>：Python自带的简单集成开发环境</li> <li>📚 <strong>标准库</strong>：大量内置的功能模块</li> <li>📦 <strong>pip</strong>：Python包管理工具，用于安装第三方库</li></ul></blockquote> <h2 id="python版本选择"><a href="#python版本选择" class="header-anchor">#</a> Python版本选择</h2> <p>目前，Python有两个版本，一个是2.x版，一个是3.x版，这两个版本是不兼容的。由于3.x版越来越普及，教程将以最新的Python 3.x版本为基础。</p> <blockquote><p><strong>版本说明</strong>：</p> <ul><li><strong>Python 2.x</strong>：已于2020年1月1日停止维护，不建议新项目使用</li> <li><strong>Python 3.x</strong>：当前主流版本，持续更新中</li> <li><strong>推荐版本</strong>：Python 3.8+ （支持最新特性，稳定性好）</li></ul></blockquote> <blockquote><p><strong>小白提醒</strong>：如果你是初学者，直接选择最新的Python 3.x版本就对了！</p></blockquote> <h2 id="在windows上安装python"><a href="#在windows上安装python" class="header-anchor">#</a> 在Windows上安装Python</h2> <p>在Windows上安装Python，有两种方法：</p> <h3 id="方法一-官方安装包-推荐新手"><a href="#方法一-官方安装包-推荐新手" class="header-anchor">#</a> 方法一：官方安装包（推荐新手）</h3> <p>可以直接从Python的官方网站下载Python 3对应的Windows安装程序，推荐下载Windows installer (64-bit)，然后，运行下载的python-3.x-amd64.exe安装包：</p> <blockquote><p><strong>下载地址</strong>：https://www.python.org/downloads/windows/</p></blockquote> <p><img src="/JavaPlusDoc/assets/img/img_2.bbc02079.png" alt="img_2.png"></p> <blockquote><p><strong>⚠️ 重要提醒</strong>：特别要注意勾上"Add Python 3.x to PATH"，这样你就可以在任何地方使用python命令了！</p></blockquote> <p><strong>安装步骤</strong>：</p> <ol><li>下载安装包</li> <li>双击运行安装程序</li> <li>✅ <strong>务必勾选</strong>"Add Python to PATH"</li> <li>点击"Install Now"</li> <li>等待安装完成</li></ol> <p><strong>验证安装</strong>：</p> <div class="language-bash extra-class"><pre class="language-bash"><code>C:<span class="token punctuation">\</span>Users<span class="token punctuation">\</span><span class="token number">2397</span><span class="token operator"><span class="token file-descriptor important">9</span>></span>python <span class="token parameter variable">--version</span>
Python <span class="token number">3.13</span>.5
</code></pre></div><blockquote><p><strong>小白解释</strong>：<code>python --version</code>命令用来查看Python版本，如果显示版本号说明安装成功！</p></blockquote> <h3 id="方法二-包管理器安装-适合进阶用户"><a href="#方法二-包管理器安装-适合进阶用户" class="header-anchor">#</a> 方法二：包管理器安装（适合进阶用户）</h3> <p>先安装一个包管理器，推荐Scoop，然后在PowerShell中通过以下命令安装Python：</p> <div class="language-powershell extra-class"><pre class="language-powershell"><code><span class="token comment"># 首先安装Scoop（如果还没有的话）</span>
<span class="token function">Set-ExecutionPolicy</span> RemoteSigned <span class="token operator">-</span>Scope CurrentUser
<span class="token function">irm</span> get<span class="token punctuation">.</span>scoop<span class="token punctuation">.</span>sh <span class="token punctuation">|</span> <span class="token function">iex</span>
<span class="token comment"># 然后安装Python</span>
scoop install python
</code></pre></div><blockquote><p><strong>Scoop的优势</strong>：</p> <ul><li>自动管理PATH环境变量</li> <li>可以同时安装多个Python版本</li> <li>卸载干净，不留垃圾文件</li> <li>命令行操作，适合开发者</li></ul></blockquote> <h2 id="在macos上安装python"><a href="#在macos上安装python" class="header-anchor">#</a> 在macOS上安装Python</h2> <p>如果你正在使用Mac，那么系统自带的Python版本是2.x。要安装最新的Python 3.x，有两个方法：</p> <h3 id="方法一-官方安装包"><a href="#方法一-官方安装包" class="header-anchor">#</a> 方法一：官方安装包</h3> <p>从Python官网下载Python 3 macOS版的安装程序，下载后双击运行并安装。</p> <blockquote><p><strong>下载地址</strong>：https://www.python.org/downloads/macos/</p></blockquote> <h3 id="方法二-homebrew安装-推荐"><a href="#方法二-homebrew安装-推荐" class="header-anchor">#</a> 方法二：Homebrew安装（推荐）</h3> <p>如果安装了包管理器Homebrew，直接通过命令安装：</p> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token comment"># 安装Python 3</span>
brew <span class="token function">install</span> python
<span class="token comment"># 验证安装</span>
python3 <span class="token parameter variable">--version</span>
</code></pre></div><blockquote><p><strong>macOS注意事项</strong>：</p> <ul><li>系统自带的<code>python</code>命令指向Python 2.x</li> <li>新安装的Python 3使用<code>python3</code>命令</li> <li>建议创建别名：<code>alias python=python3</code></li></ul></blockquote> <h2 id="在linux上安装python"><a href="#在linux上安装python" class="header-anchor">#</a> 在Linux上安装Python</h2> <p>大多数Linux发行版都预装了Python，但可能版本较旧。以下是常见发行版的安装方法：</p> <h3 id="ubuntu-debian系统"><a href="#ubuntu-debian系统" class="header-anchor">#</a> Ubuntu/Debian系统</h3> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token comment"># 更新包列表</span>
<span class="token function">sudo</span> <span class="token function">apt</span> update
<span class="token comment"># 安装Python 3</span>
<span class="token function">sudo</span> <span class="token function">apt</span> <span class="token function">install</span> python3 python3-pip
<span class="token comment"># 验证安装</span>
python3 <span class="token parameter variable">--version</span>
</code></pre></div><h3 id="centos-rhel系统"><a href="#centos-rhel系统" class="header-anchor">#</a> CentOS/RHEL系统</h3> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token comment"># 安装Python 3</span>
<span class="token function">sudo</span> yum <span class="token function">install</span> python3 python3-pip
<span class="token comment"># 或者在较新版本中使用</span>
<span class="token function">sudo</span> dnf <span class="token function">install</span> python3 python3-pip
</code></pre></div><h3 id="arch-linux"><a href="#arch-linux" class="header-anchor">#</a> Arch Linux</h3> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token comment"># 安装Python 3</span>
<span class="token function">sudo</span> pacman <span class="token parameter variable">-S</span> python python-pip
</code></pre></div><blockquote><p><strong>Linux小贴士</strong>：如果你正在使用Linux，建议你有一定的系统管理经验。如果完全是新手，建议先从Windows开始学习Python。</p></blockquote> <h2 id="测试python交互环境"><a href="#测试python交互环境" class="header-anchor">#</a> 测试Python交互环境</h2> <p>安装完成后，打开命令行输入<code>python</code>（Windows）或<code>python3</code>（macOS/Linux），你会看到类似这样的界面：</p> <div class="language-python extra-class"><pre class="language-python"><code>C<span class="token punctuation">:</span>\Users\<span class="token number">23979</span><span class="token operator">></span>python
Python <span class="token number">3.13</span><span class="token number">.5</span> <span class="token punctuation">(</span>tags<span class="token operator">/</span>v3<span class="token punctuation">.</span><span class="token number">13.5</span><span class="token punctuation">:</span>6cb20a2<span class="token punctuation">,</span> Jun <span class="token number">11</span> <span class="token number">2025</span><span class="token punctuation">,</span> <span class="token number">16</span><span class="token punctuation">:</span><span class="token number">15</span><span class="token punctuation">:</span><span class="token number">46</span><span class="token punctuation">)</span> <span class="token punctuation">[</span>MSC v<span class="token punctuation">.</span><span class="token number">1943</span> <span class="token number">64</span> bit <span class="token punctuation">(</span>AMD64<span class="token punctuation">)</span><span class="token punctuation">]</span> on win32
Type <span class="token string">"help"</span><span class="token punctuation">,</span> <span class="token string">"copyright"</span><span class="token punctuation">,</span> <span class="token string">"credits"</span> <span class="token keyword">or</span> <span class="token string">"license"</span> <span class="token keyword">for</span> more information<span class="token punctuation">.</span>
<span class="token operator">>></span><span class="token operator">></span> <span class="token number">1</span><span class="token operator">+</span><span class="token number">1</span>
<span class="token number">2</span>
<span class="token operator">>></span><span class="token operator">></span> <span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"Hello, Python!"</span><span class="token punctuation">)</span>
Hello<span class="token punctuation">,</span> Python!
<span class="token operator">>></span><span class="token operator">></span> exit<span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre></div><blockquote><p><strong>交互环境说明</strong>：</p> <ul><li><code>>>></code>是Python的提示符，表示等待你输入代码</li> <li>输入代码后按回车，立即看到结果</li> <li>输入<code>exit()</code>或按<code>Ctrl+Z</code>（Windows）/<code>Ctrl+D</code>（macOS/Linux）退出</li></ul></blockquote> <h2 id="python解释器详解"><a href="#python解释器详解" class="header-anchor">#</a> Python解释器详解</h2> <p>当我们编写Python代码时，我们得到的是一个包含Python代码的以.py为扩展名的文本文件。要运行代码，就需要Python解释器去执行.py文件。</p> <blockquote><p><strong>小白理解</strong>：解释器就像一个翻译官，把你写的Python代码翻译成计算机能理解的机器语言。</p></blockquote> <h3 id="多种python解释器"><a href="#多种python解释器" class="header-anchor">#</a> 多种Python解释器</h3> <p>由于整个Python语言从规范到解释器都是开源的，所以理论上，只要水平够高，任何人都可以编写Python解释器来执行Python代码（当然难度很大）。事实上，确实存在多种Python解释器：</p> <blockquote><p><strong>主要Python解释器</strong>：</p> <p>🔥 <strong>CPython</strong>（官方，推荐）</p> <ul><li>用C语言开发，最标准的实现</li> <li>使用最广泛，兼容性最好</li> <li>我们通常说的"Python"就是指CPython</li></ul> <p>⚡ <strong>PyPy</strong>（高性能）</p> <ul><li>用Python自己写的Python解释器</li> <li>执行速度比CPython快2-10倍</li> <li>适合计算密集型程序</li></ul> <p>☕ <strong>Jython</strong>（Java平台）</p> <ul><li>运行在Java虚拟机上</li> <li>可以调用Java类库</li> <li>适合Java环境集成</li></ul> <p>🌐 <strong>IronPython</strong>（.NET平台）</p> <ul><li>运行在.NET平台上</li> <li>可以调用.NET类库</li> <li>适合Windows/.NET环境</li></ul></blockquote> <h3 id="cpython解释器"><a href="#cpython解释器" class="header-anchor">#</a> CPython解释器</h3> <p>当我们从Python官方网站下载并安装好Python 3.x后，我们就直接获得了一个官方版本的解释器：CPython。这个解释器是用C语言开发的，所以叫CPython。在命令行下运行python就是启动CPython解释器。</p> <p>CPython是使用最广的Python解释器。教程的所有代码也都在CPython下执行。</p> <blockquote><p><strong>为什么选择CPython？</strong></p> <ul><li>✅ 官方标准实现，最稳定可靠</li> <li>✅ 第三方库支持最完整</li> <li>✅ 文档和社区支持最好</li> <li>✅ 适合初学者和生产环境</li></ul></blockquote> <h2 id="常见问题解答"><a href="#常见问题解答" class="header-anchor">#</a> 常见问题解答</h2> <blockquote><p><strong>Q: 安装后找不到python命令怎么办？</strong></p> <p>A: 检查是否勾选了"Add Python to PATH"。如果没有，可以：</p> <ol><li>重新安装Python并勾选该选项</li> <li>手动添加Python安装目录到系统PATH</li> <li>使用完整路径运行：<code>C:\Python39\python.exe</code></li></ol></blockquote> <blockquote><p><strong>Q: python和python3命令有什么区别？</strong></p> <p>A:</p> <ul><li><strong>Windows</strong>：通常都是<code>python</code></li> <li><strong>macOS/Linux</strong>：<code>python</code>可能指向Python 2.x，<code>python3</code>指向Python 3.x</li> <li>建议在macOS/Linux上使用<code>python3</code>命令</li></ul></blockquote> <blockquote><p><strong>Q: 如何同时安装多个Python版本？</strong></p> <p>A:</p> <ul><li>使用<strong>pyenv</strong>（macOS/Linux）或<strong>pyenv-win</strong>（Windows）</li> <li>使用<strong>Anaconda</strong>管理多个环境</li> <li>手动安装到不同目录</li></ul></blockquote> <h2 id="下一步"><a href="#下一步" class="header-anchor">#</a> 下一步</h2> <p>恭喜！你已经成功安装了Python。现在你可以：</p> <ul><li>在命令行中使用Python交互环境</li> <li>编写并运行你的第一个Python程序</li> <li>开始学习Python语法</li></ul> <blockquote><p><strong>学习建议</strong>：先熟悉Python交互环境，它是学习和测试代码的好工具。在交互环境中，你可以立即看到代码的执行结果，这对理解Python语法非常有帮助。</p></blockquote></div></section> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev"><a href="/JavaPlusDoc/Python/1.html" class="prev">
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