擅长:python、mysql、java
<p>它在Python 2和Python 3中都可以工作</p>
<pre><code>hasattr(connection, 'invert_opt')
</code></pre>
<p>如果连接对象定义了函数<code>invert_opt</code>,则<code>hasattr</code>返回<code>True</code>。这是给你的文件</p>
<p><a href="https://docs.python.org/2/library/functions.html#hasattr" rel="noreferrer">https://docs.python.org/2/library/functions.html#hasattr</a>
<a href="https://docs.python.org/3/library/functions.html#hasattr" rel="noreferrer">https://docs.python.org/3/library/functions.html#hasattr</a></p>