擅长:python、mysql、java
<p>您以写入附加模式打开了文件。因此,<code>readlines</code>返回一个空列表。
相反,读取文件,关闭它,然后以<code>w</code>模式重新打开以覆盖原始内容</p>
<pre><code>with open("test.txt", "r") as f:
content = [line.strip() for line in f.readlines()]
with open("test.txt", "w") as f:
f.write(",\n".join(content)+",")
</code></pre>