擅长:python、mysql、java
<p>字符串在Python中是不可变的。因此,当您调用<code>item.replace(",", "")</code>时,该方法返回您想要的内容,但它不会存储在任何地方(因此不会存储在<code>item</code>)。你知道吗</p>
<p><strong>编辑:</strong></p>
<p>我建议:</p>
<pre><code>for i in range(len(downloadCount_clean)):
if "," in downloadCount_clean[i]:
downloadCount_clean[i] = downloadCount_clean[i].replace(",", "")
</code></pre>
<p><strong>第二次编辑:</strong></p>
<p>为了更加简单和/或优雅:</p>
<pre><code>for index,value in enumerate(downloadCount_clean):
downloadCount_clean[index] = int(value.replace(",", ""))
</code></pre>