擅长:python、mysql、java
<p>在一行中</p>
<p><code>v = max(v) if v else None</code></p>
<pre><code>>>> v = []
>>> max(v)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: max() arg is an empty sequence
>>> v = max(v) if v else None
>>> v
>>>
</code></pre>