擅长:python、mysql、java
<pre><code>import itertools
chain = itertools.chain(*mylist)
print(set(chain))
</code></pre>
<p>取自<a href="https://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python">Flattening a shallow list in Python</a>并改编用于本问题。</p>