擅长:python、mysql、java
<p>使用<code>set</code></p>
<pre class="lang-py prettyprint-override"><code>def is_valid(vote):
return len(set(vote)) == len(vote)
print(is_valid('4432')) # False
print(is_valid('1234')) # True
</code></pre>
<hr/>
<pre class="lang-py prettyprint-override"><code>voteListString = ['2314', '4432', '4312', '1243', '1234', '2431']
new_vote_list_string = list(filter(is_valid, voteListString))
print(new_vote_list_string)
</code></pre>
<pre><code>['2314', '4312', '1243', '1234', '2431']
</code></pre>