擅长:python、mysql、java
<p><code>isnull</code>是<code>isna</code>的别名。字面上在<a href="https://github.com/pandas-dev/pandas/blob/0409521665bd436a10aea7e06336066bf07ff057/pandas/core/dtypes/missing.py#L109" rel="noreferrer">code source of pandas</a>中:</p>
<pre><code>isnull = isna
</code></pre>
<p>事实上:</p>
<pre><code>>>> pd.isnull
<function isna at 0x7fb4c5cefc80>
</code></pre>
<p>因此我建议使用<code>isna</code></p>