擅长:python、mysql、java
<p><a href="https://docs.python.org/3/library/functions.html#max" rel="noreferrer">^{<cd1>}</a>接受可选的<code>key</code>参数;<code>max</code>比较<code>key</code>函数的返回值以确定哪个更大。你知道吗</p>
<pre><code>maxvalue = max(listofcounties, key=lambda x: x[-1])
</code></pre>
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<pre><code>>>> listofcounties = [['county1', 10], ['county2', 20], ['county3', 5]]
>>> max(listofcounties, key=lambda x: x[-1]) # by using `key`, max compares 10, 20, 5
['county2', 20]
</code></pre>