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12 <div class="top-l">笔记客 · 阿May</div>
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17 <div class="row"><div class="nm" style="font-size:16px;font-weight:800">Python 装饰器入门</div>
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19 <div class="row" style="margin-top:10px"><div class="avatar">May</div><div class="info" style="flex:1"><div class="nm" style="font-size:13px">阿May</div><div class="muted">2026-07-12 · 阅读 4.8k</div></div>
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24 <h1>Python 装饰器入门</h1>
25 <p>装饰器是<strong>在不修改原函数</strong>的前提下，为其动态添加功能的高阶函数。</p>
26 <h2>一、最基础写法</h2>
27 <p>用 <code>@</code> 把一个函数包裹起来：</p>
28 <pre><code>def log(func):
29 def wrapper(*a, **k):
30 print("调用:", func.__name__)
31 return func(*a, **k)
32 return wrapper
33
34@log
35def add(x, y):
36 return x + y</code></pre>
37 <h2>二、带参数的装饰器</h2>
38 <p>再包一层即可接收参数，常见用途：</p>
39 <ul>
40 <li>权限校验</li>
41 <li>缓存（<code>lru_cache</code>）</li>
42 <li>重试与限流</li>
43 </ul>
44 <blockquote>记住一句话：装饰器 = 高阶函数 + 语法糖。</blockquote>
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