擅长:python、mysql、java
<p>它不需要任何库(即使是标准的itertools)。只需将列表乘以整数即可</p>
<pre><code>In[11]: x = ["cat", "dog", "chicken"]
In[12]: x * 3
Out[12]: ['cat', 'dog', 'chicken', 'cat', 'dog', 'chicken', 'cat', 'dog', 'chicken']
In[13]: sorted(x * 3)
Out[13]: ['cat', 'cat', 'cat', 'chicken', 'chicken', 'chicken', 'dog', 'dog', 'dog']
</code></pre>