擅长:python、mysql、java
<pre><code>In [126]: data = [[1, ["cat", "dog"]],
...: [2, ["dog", "mouse", "elephant"]],
...: [3, ["mouse", "giraffe"]]]
In [127]: [[x] for x in {animal for row in data for animal in row[1]}]
Out[127]: [['giraffe'], ['mouse'], ['elephant'], ['cat'], ['dog']]
</code></pre>