擅长:python、mysql、java
<p>一个列表可以:</p>
<pre><code>[(i,j) for i in a for j in b]
</code></pre>
<p><strong>输出:</strong></p>
<pre><code>>>> a = [1, 2]
>>> b = [3, 4]
>>> [(i,j) for i in a for j in b]
[(1, 3), (1, 4), (2, 3), (2, 4)]
</code></pre>