擅长:python、mysql、java
<p>通过使用<code>numpy.where</code>以及我从<a href="https://stackoverflow.com/questions/46525270/pandas-ternary-conditional-operator-for-setting-a-value-in-a-dataframe">@jezrael</a>的解中发现的三元运算符。你知道吗</p>
<pre><code>df['col3'] = np.where(df['col1'].isin(df1['col1']) & df['col2'].isin(df1['col2']), df1['col3'], df['col3'])
</code></pre>