擅长:python、mysql、java
<p>你有:</p>
<pre><code>while servqual != "great" or "good" or "lacking" or "poor":
</code></pre>
<p>其含义与:</p>
^{pr2}$
<p>由于<code>"good" or "lacking" or "poor"</code>始终为真,因此整个条件为真。在</p>
<p>而不是这样,你可以这样做:</p>
<pre><code>while servqual not in ("great", "good", "lacking", "poor"):
...
</code></pre>