擅长:python、mysql、java
<p>我认为更改该值的最快方法是使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.loc.html" rel="nofollow noreferrer">^{<cd1>}</a>而不是<code>apply</code>,因为<code>.loc</code>是针对<code>pandas</code>优化的</p>
<pre><code>df.loc[df.Country != 'Mainland China', 'Country'] = 'Others'
</code></pre>