擅长:python、mysql、java
<p><a href="https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.replace.html" rel="nofollow noreferrer">https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.replace.html</a></p>
<p>正如评论中所提到的那样</p>
<pre><code>x.replace(None, 'N/A', True)
</code></pre>