擅长:python、mysql、java
<p>我怀疑你想改变你的逻辑</p>
<pre class="lang-py prettyprint-override"><code>if vWHEN != "before" and vWHEN != "after":
exit("ERROR: " + vWHEN + " is invalid. Should be: 'before' or 'after'")
</code></pre>
<p>当您使用<code>or</code>而不是<code>and</code>时,无论<code>vWHEN</code>的值是多少,它都将始终进入<code>if</code>主体</p>