擅长:python、mysql、java
<p>如果您的设备列表是<code>list_of_shields</code>,您可以像这样实现您想要的:</p>
<pre><code>choice = raw_input('choose a valid shield from the list please:')
while choice not in list_of_shields:
choice = raw_input('choose a valid shield from the list please:')
</code></pre>