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<span id="id1"></span><h1>LLEN<a class="headerlink" href="#llen" title="Permalink to this headline">¶</a></h1>
<p><strong>LLEN key</strong></p>
<p>返回列表 <code class="docutils literal"><span class="pre">key</span></code> 的长度。</p>
<p>如果 <code class="docutils literal"><span class="pre">key</span></code> 不存在，则 <code class="docutils literal"><span class="pre">key</span></code> 被解释为一个空列表，返回 <code class="docutils literal"><span class="pre">0</span></code> .</p>
<p>如果 <code class="docutils literal"><span class="pre">key</span></code> 不是列表类型，返回一个错误。</p>
<dl class="docutils">
<dt><strong>可用版本：</strong></dt>
<dd>>= 1.0.0</dd>
<dt><strong>时间复杂度：</strong></dt>
<dd>O(1)</dd>
<dt><strong>返回值：</strong></dt>
<dd>列表 <code class="docutils literal"><span class="pre">key</span></code> 的长度。</dd>
</dl>
<div class="highlight-python"><div class="highlight"><pre># 空列表
redis> LLEN job
(integer) 0
# 非空列表
redis> LPUSH job "cook food"
(integer) 1
redis> LPUSH job "have lunch"
(integer) 2
redis> LLEN job
(integer) 2
</pre></div>
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