擅长:python、mysql、java
<p>您可以使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.fillna.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>df['A'].fillna('noted')
</code></pre>
<hr/>
<p>或者,如果<code>NA</code>是字符串而不是<code>np.nan</code>,则可以使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.replace.html" rel="nofollow noreferrer">^{<cd4>}</a>:</p>
<pre><code>df['A'].replace(['NA'], 'noted')
</code></pre>