擅长:python、mysql、java
<blockquote>
<p>how come only one list appears here and not all of them?</p>
</blockquote>
<p><code>populationList</code>在每次迭代后都会发生变化,并丢失(通过覆盖)其早期值。你知道吗</p>
<p>相反,您应该尝试以下方法:</p>
<pre><code>for populationLine in populationFile:
populationList.append(populationLine.split())
</code></pre>