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<h1 class="entry-title">python exec和eval语句</h1>
<p class="meta"><time datetime="2014-07-02T00:00:00+08:00" pubdate>Wed 02 July 2014</time></p>
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<div class="entry-content"><h5>exec语句用来执行储存在字符串或文件中的Python语句。例如，我们可以在运行时生成一个包含Python代码的字符串，然后使用exec语句执行这些语句。下面是一个简单的例子。</h5>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">exec</span> <span class="err">'</span><span class="n">print</span> <span class="s">"Hello World"</span><span class="err">'</span>
<span class="n">Hello</span> <span class="n">World</span>
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<h6>eval语句用来计算存储在字符串中的有效Python表达式。下面是一个简单的例子。</h6>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">eval</span><span class="p">(</span><span class="err">'</span><span class="mi">2</span><span class="o">*</span><span class="mi">3</span><span class="err">'</span><span class="p">)</span>
<span class="mi">6</span>
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