擅长:python、mysql、java
<p>假设数据文件中每个学生的分数超过1分,例如:</p>
<pre class="lang-none prettyprint-override"><code>Josh Hill,8,4,0,1,2
Lisa Hale,7,6,3,4,5
Max Wood,10,12,6,7,8
Sally Jones,5,5,9,10,11
David West,2,8,12,13,14
</code></pre>
<p>您可以使用<a href="https://docs.python.org/3/reference/expressions.html#slicings" rel="nofollow">slice syntax</a>从每行中提取最后三个分数,如下所示:</p>
^{pr2}$
<p>输出:</p>
<pre class="lang-none prettyprint-override"><code>classonelist:
Josh Hill, last three scores: [0, 1, 2]
Lisa Hale, last three scores: [3, 4, 5]
Max Wood, last three scores: [6, 7, 8]
Sally Jones, last three scores: [9, 10, 11]
David West, last three scores: [12, 13, 14]
</code></pre>