擅长:python、mysql、java
<p>@neversaint,试试这个:</p>
<pre><code>x = [["foo", 3.923239], ["bar", 1.22333]]
for i, j in enumerate(x):
x[i][1] = round(j[1], 3)
print x
</code></pre>
<p>输出:</p>
<pre><code>[['foo', 3.923], ['bar', 1.223]]
</code></pre>
<p>干杯</p>