电脑/python/官方内置模块/ast模块.html

<!DOCTYPE html>
<html>
<head>
<!-- 2016-07-30 六 23:05 -->
<meta  charset="utf-8">
<meta  name="viewport" content="width=device-width, initial-scale=1">
<title>ast模块</title>
<meta  name="generator" content="Org-mode">
<meta  name="author" content="万泽(德山书生)">
<meta  name="description" content="制作者邮箱：a358003542@gmail.com"
>
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<h1 class="title">ast模块</h1>
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<h2>Table of Contents</h2>
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<ul>
<li><a href="#orgheadline1">1. literal_eval函数</a></li>
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<p>
更多信息请参看 <a href="https://docs.python.org/3.4/library/ast.html">官方文档</a> 。
</p>

<div class="outline-2">
<h2 id="orgheadline1">literal_eval函数</h2>
<div class="outline-text-2" id="text-1">
<p>
literal_eval函数是一个非常有用的函数，其可用于将某个短小的python字符串转化成python object。如下所示:
</p>
<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">ast</span>
<span class="k">def</span> <span class="nf">str2pyobj</span><span class="p">(</span><span class="n">val</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;str to python obj or not changed&#39;&#39;&#39;</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="n">val</span> <span class="o">=</span> <span class="n">ast</span><span class="o">.</span><span class="n">literal_eval</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
    <span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span><span class="c1">###</span>
        <span class="k">pass</span>
    <span class="k">return</span> <span class="n">val</span>
</pre></div>

<p>
支持的python object有: strings, bytes, numbers, tuples, lists, dicts, sets, booleans, and None.
</p>

<p>
所以一般的字符串如 "1" "3.14" "[1,2,3]" 将其分别转化成为integer float 和list是小菜一碟。当然最好建立异常捕捉，如果转化失败，则原样返回字符串即可。
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