擅长:python、mysql、java
<p>您需要再次查看<a href="https://docs.python.org/3/library/stdtypes.html#str.replace" rel="nofollow noreferrer">the documentation</a>:</p>
<blockquote>
<p>Return a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced.</p>
</blockquote>
<p>换句话说,<code>item.replace("\n"," ")</code>本身什么也不做。你知道吗</p>