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coding-agent


			
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  <h1>3.1 Python日志介绍与应用</h1>

<h2 id="_1">学习目标<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<ol>
<li>理解日志记录的作用及其在程序开发中的重要性。</li>
<li>掌握Python <code>logging</code> 模块的基本用法。</li>
<li>学会通过示例配置日志级别、格式，并将日志存储到文件中。</li>
<li>在工程化项目中应用日志记录，追踪程序运行状态。</li>
</ol>
<hr />
<h2 id="_2">一、日志记录概述<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<h3 id="1">1 概述<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>
<p>日志（Logging）是程序运行时记录关键信息的一种方式，例如操作成功、错误发生或调试信息。它在开发和维护中非常重要，因为：</p>
<ul>
<li>
<p><strong>调试</strong>：帮助找到代码中的问题。</p>
</li>
<li>
<p><strong>监控</strong>：记录程序的运行状态。</p>
</li>
<li><strong>审计</strong>：追踪用户或系统的行为。</li>
</ul>
<p>Python的<code>logging</code>模块是一个内置工具，提供灵活的日志记录功能，比简单的<code>print</code>语句更强大。</p>
<h3 id="2">2 核心概念<a class="headerlink" href="#2" title="Permanent link">&para;</a></h3>
<ol>
<li><strong>日志级别</strong>：表示日志的重要性，常见级别从低到高：</li>
<li><code>DEBUG</code>：调试信息（最低）。</li>
<li><code>INFO</code>：一般信息。</li>
<li><code>WARNING</code>：警告，可能有问题。</li>
<li><code>ERROR</code>：错误，已影响程序。</li>
<li><code>CRITICAL</code>：严重错误（最高）。</li>
<li><strong>日志处理器（Handler）</strong>：决定日志输出到哪里（如控制台或文件）。</li>
<li><strong>日志格式（Formatter）</strong>：定义日志的显示样式（如时间、级别、消息）。</li>
</ol>
<hr />
<h2 id="_3">二、基础日志记录<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
<h3 id="1_1">1 目标<a class="headerlink" href="#1_1" title="Permanent link">&para;</a></h3>
<p>通过简单示例展示如何记录日志到控制台。</p>
<h3 id="2_1">2 代码<a class="headerlink" href="#2_1" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 配置基本的日志设置</span>
<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">)</span>

<span class="c1"># 获取日志记录器</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;Example1&quot;</span><span class="p">)</span>

<span class="c1"># 记录不同级别的日志</span>
<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;这是调试信息，通常用于开发&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;程序运行正常&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;注意，可能有小问题&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;发生错误&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">critical</span><span class="p">(</span><span class="s2">&quot;严重错误，程序可能崩溃&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="3">3 运行结果<a class="headerlink" href="#3" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 INFO Example1: 程序运行正常
2025-04-01 10:00:00,124 WARNING Example1: 注意，可能有小问题
2025-04-01 10:00:00,125 ERROR Example1: 发生错误
2025-04-01 10:00:00,126 CRITICAL Example1: 严重错误，程序可能崩溃
</code></pre></div>
<h3 id="4">4 分析<a class="headerlink" href="#4" title="Permanent link">&para;</a></h3>
<ul>
<li><code>basicConfig(level=logging.INFO)</code>设置最低记录级别为<code>INFO</code>，因此<code>DEBUG</code>信息未显示。</li>
<li>日志默认输出到控制台，格式为<code>时间 级别 名称: 消息</code>。</li>
</ul>
<hr />
<h2 id="_4">三、自定义日志格式<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h2>
<h3 id="1_2">1 目标<a class="headerlink" href="#1_2" title="Permanent link">&para;</a></h3>
<p>自定义日志输出格式，添加时间和级别。</p>
<h3 id="2_2">2 代码<a class="headerlink" href="#2_2" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 配置日志格式</span>
<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span>
    <span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">,</span>
    <span class="nb">format</span><span class="o">=</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span>
<span class="p">)</span>

<span class="c1"># 获取日志记录器</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;Example2&quot;</span><span class="p">)</span>

<span class="c1"># 记录日志</span>
<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;调试模式已开启&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;正在处理数据&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;数据处理失败&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="3_1">3 运行结果<a class="headerlink" href="#3_1" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - DEBUG - 调试模式已开启
2025-04-01 10:00:00,124 - INFO - 正在处理数据
2025-04-01 10:00:00,125 - ERROR - 数据处理失败
</code></pre></div>
<h3 id="4_1">4 分析<a class="headerlink" href="#4_1" title="Permanent link">&para;</a></h3>
<ul>
<li><code>format</code>参数使用占位符：</li>
<li><code>%(asctime)s</code>：记录时间。</li>
<li><code>%(levelname)s</code>：日志级别。</li>
<li><code>%(message)s</code>：日志消息。</li>
<li>级别设为<code>DEBUG</code>，所有日志都显示。</li>
</ul>
<hr />
<h2 id="_5">四、将日志存储到文件<a class="headerlink" href="#_5" title="Permanent link">&para;</a></h2>
<h3 id="1_3">1 目标<a class="headerlink" href="#1_3" title="Permanent link">&para;</a></h3>
<p>将日志保存到文件中，便于后续查看。</p>
<h3 id="2_3">2 代码<a class="headerlink" href="#2_3" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 配置日志，输出到文件</span>
<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span>
    <span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">,</span>
    <span class="nb">format</span><span class="o">=</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">,</span>
    <span class="n">filename</span><span class="o">=</span><span class="s1">&#39;app.log&#39;</span><span class="p">,</span>  <span class="c1"># 日志文件路径</span>
    <span class="n">filemode</span><span class="o">=</span><span class="s1">&#39;a&#39;</span>         <span class="c1"># &#39;a&#39;表示追加，&#39;w&#39;表示覆盖</span>
<span class="p">)</span>

<span class="c1"># 获取日志记录器</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;Example3&quot;</span><span class="p">)</span>

<span class="c1"># 记录日志</span>
<span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;程序启动&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;内存使用率较高&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;无法连接数据库&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="3_2">3 运行结果<a class="headerlink" href="#3_2" title="Permanent link">&para;</a></h3>
<ul>
<li>控制台无输出，日志写入<code>app.log</code>文件：
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - INFO - 程序启动
2025-04-01 10:00:00,124 - WARNING - 内存使用率较高
2025-04-01 10:00:00,125 - ERROR - 无法连接数据库
</code></pre></div></li>
</ul>
<h3 id="4_2">4 分析<a class="headerlink" href="#4_2" title="Permanent link">&para;</a></h3>
<ul>
<li><code>filename</code>指定日志文件路径。</li>
<li><code>filemode='a'</code>确保日志追加写入，不覆盖之前的内容。</li>
</ul>
<hr />
<h2 id="_6">五、同时输出到控制台和文件<a class="headerlink" href="#_6" title="Permanent link">&para;</a></h2>
<h3 id="1_4">1 目标<a class="headerlink" href="#1_4" title="Permanent link">&para;</a></h3>
<p>将日志同时记录到控制台和文件中。</p>
<h3 id="2_4">2 代码<a class="headerlink" href="#2_4" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 创建日志记录器</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;Example4&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>  <span class="c1"># 设置记录器级别</span>

<span class="c1"># 创建控制台处理器</span>
<span class="n">console_handler</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">StreamHandler</span><span class="p">()</span>
<span class="n">console_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">)</span>  <span class="c1"># 控制台显示INFO及以上级别</span>

<span class="c1"># 创建文件处理器</span>
<span class="n">file_handler</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">FileHandler</span><span class="p">(</span><span class="s1">&#39;app.log&#39;</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">&#39;a&#39;</span><span class="p">)</span>
<span class="n">file_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>  <span class="c1"># 文件记录DEBUG及以上级别</span>

<span class="c1"># 定义日志格式</span>
<span class="n">formatter</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">Formatter</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">)</span>

<span class="c1"># 为处理器设置格式</span>
<span class="n">console_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">formatter</span><span class="p">)</span>
<span class="n">file_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">formatter</span><span class="p">)</span>

<span class="c1"># 将处理器添加到记录器</span>
<span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">console_handler</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">file_handler</span><span class="p">)</span>

<span class="c1"># 记录日志</span>
<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;调试信息，仅写入文件&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;程序运行正常&quot;</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;发生错误&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="3_3">3 运行结果<a class="headerlink" href="#3_3" title="Permanent link">&para;</a></h3>
<ul>
<li><strong>控制台输出</strong>：
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - INFO - 程序运行正常
2025-04-01 10:00:00,124 - ERROR - 发生错误
</code></pre></div></li>
<li><strong>app.log文件内容</strong>：
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - DEBUG - 调试信息，仅写入文件
2025-04-01 10:00:00,124 - INFO - 程序运行正常
2025-04-01 10:00:00,125 - ERROR - 发生错误
</code></pre></div></li>
</ul>
<h3 id="4_3">4 分析<a class="headerlink" href="#4_3" title="Permanent link">&para;</a></h3>
<ul>
<li>使用<code>Handler</code>分别控制输出目标：</li>
<li><code>StreamHandler</code>：输出到控制台。</li>
<li><code>FileHandler</code>：输出到文件。</li>
<li>不同处理器可设置不同级别，灵活性更高。</li>
</ul>
<hr />
<h2 id="_7">六、代码实现<a class="headerlink" href="#_7" title="Permanent link">&para;</a></h2>
<h3 id="1_5">1 整体结构<a class="headerlink" href="#1_5" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code>logging_lesson/
├── logs/
│   └── app.log      # 日志文件
├── utils/
│   └── logger.py    # 日志配置模块
├── main.py          # 主程序入口
└── requirements.txt # 依赖文件（本例无需额外依赖）
</code></pre></div>
<h3 id="2_5">2 具体模块<a class="headerlink" href="#2_5" title="Permanent link">&para;</a></h3>
<h4 id="21-utilsloggerpy">2.1 日志配置模块 (<code>utils/logger.py</code>)<a class="headerlink" href="#21-utilsloggerpy" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">os</span>

<span class="k">def</span><span class="w"> </span><span class="nf">setup_logger</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">log_file</span><span class="o">=</span><span class="s1">&#39;logs/app.log&#39;</span><span class="p">):</span>
    <span class="c1"># 确保日志目录存在</span>
    <span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">log_file</span><span class="p">),</span> <span class="n">exist_ok</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

    <span class="c1"># 创建日志记录器</span>
    <span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>  <span class="c1"># 设置最低级别</span>

    <span class="c1"># 创建控制台处理器</span>
    <span class="n">console_handler</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">StreamHandler</span><span class="p">()</span>
    <span class="n">console_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">)</span>

    <span class="c1"># 创建文件处理器</span>
    <span class="n">file_handler</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">FileHandler</span><span class="p">(</span><span class="n">log_file</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">&#39;a&#39;</span><span class="p">)</span>
    <span class="n">file_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>

    <span class="c1"># 定义日志格式</span>
    <span class="n">formatter</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">Formatter</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(name)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">)</span>

    <span class="c1"># 设置处理器格式</span>
    <span class="n">console_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">formatter</span><span class="p">)</span>
    <span class="n">file_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">formatter</span><span class="p">)</span>

    <span class="c1"># 添加处理器（避免重复添加）</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">logger</span><span class="o">.</span><span class="n">handlers</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">console_handler</span><span class="p">)</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">file_handler</span><span class="p">)</span>

    <span class="k">return</span> <span class="n">logger</span>
</code></pre></div>
<h4 id="22-mainpy">2.2 主程序 (<code>main.py</code>)<a class="headerlink" href="#22-mainpy" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code><span class="kn">from</span><span class="w"> </span><span class="nn">utils.logger</span><span class="w"> </span><span class="kn">import</span> <span class="n">setup_logger</span>

<span class="c1"># 初始化日志记录器</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">setup_logger</span><span class="p">(</span><span class="s2">&quot;MainApp&quot;</span><span class="p">)</span>

<span class="k">def</span><span class="w"> </span><span class="nf">process_data</span><span class="p">(</span><span class="n">data</span><span class="p">):</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;开始处理数据: </span><span class="si">{</span><span class="n">data</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;数据为空，无法处理&quot;</span><span class="p">)</span>
        <span class="k">return</span> <span class="kc">None</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;数据处理完成&quot;</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">data</span><span class="o">.</span><span class="n">upper</span><span class="p">()</span>

<span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;程序启动&quot;</span><span class="p">)</span>
    <span class="n">result</span> <span class="o">=</span> <span class="n">process_data</span><span class="p">(</span><span class="s2">&quot;hello&quot;</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">result</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;处理结果: </span><span class="si">{</span><span class="n">result</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;处理失败&quot;</span><span class="p">)</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;程序结束&quot;</span><span class="p">)</span>

<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
    <span class="n">main</span><span class="p">()</span>
</code></pre></div>
<h4 id="23">2.3 运行结果<a class="headerlink" href="#23" title="Permanent link">&para;</a></h4>
<ul>
<li><strong>控制台输出</strong>：
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - INFO - MainApp - 程序启动
2025-04-01 10:00:00,124 - INFO - MainApp - 数据处理完成
2025-04-01 10:00:00,125 - INFO - MainApp - 处理结果: HELLO
2025-04-01 10:00:00,126 - INFO - MainApp - 程序结束
</code></pre></div></li>
<li><strong>logs/app.log 文件内容</strong>：
<div class="highlight"><pre><span></span><code>2025-04-01 10:00:00,123 - INFO - MainApp - 程序启动
2025-04-01 10:00:00,124 - DEBUG - MainApp - 开始处理数据: hello
2025-04-01 10:00:00,125 - INFO - MainApp - 数据处理完成
2025-04-01 10:00:00,126 - INFO - MainApp - 处理结果: HELLO
2025-04-01 10:00:00,127 - INFO - MainApp - 程序结束
</code></pre></div></li>
</ul>
<hr />
<h2 id="_8">本章小结<a class="headerlink" href="#_8" title="Permanent link">&para;</a></h2>
<p>本课通过示例讲解了Python <code>logging</code> 模块的使用：</p>
<ul>
<li>
<p><strong>基础</strong>：使用<code>basicConfig</code>快速配置日志。</p>
</li>
<li>
<p><strong>自定义</strong>：设置格式、级别和输出目标。</p>
</li>
<li><strong>存储</strong>：将日志保存到文件，同时支持控制台输出。</li>
<li><strong>工程化</strong>：封装日志配置为模块，便于复用。</li>
</ul>
<h3 id="_9">应用场景<a class="headerlink" href="#_9" title="Permanent link">&para;</a></h3>
<ul>
<li>在QA系统中，记录数据库连接、检索结果等状态。</li>
<li>调试时使用<code>DEBUG</code>级别，生产环境调整为<code>INFO</code>或<code>ERROR</code>。</li>
</ul>


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