擅长:python、mysql、java
<p>这里尝试使用<a href="https://pandas.pydata.org/docs/reference/api/pandas.Series.duplicated.html" rel="nofollow noreferrer">^{<cd1>}</a>创建布尔掩码</p>
<pre><code>import numpy as np
remove = lambda x: df[x].duplicated(keep='first') # return boolean mask
df.loc[remove('people_vaccinated'), 'people_vaccinated'] = np.NaN
</code></pre>