擅长:python、mysql、java
<p>检查优先级:<a href="http://docs.python.org/reference/expressions.html#summary" rel="nofollow">http://docs.python.org/reference/expressions.html#summary</a></p>
<p>它将在每一个情况下在<code>or</code>之前对<code>and</code>进行评估。你知道吗</p>
<p><code>1 or 2 and 3</code>==<code>1 or (2 and 3)</code></p>