擅长:python、mysql、java
<p>可以使用函数<a href="http://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.where.html#numpy.where" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>df['D'] = np.where(df['C'] == ' Description', df['B'], df['C'])
</code></pre>
<p>或者方法<a href="http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.mask.html#pandas.DataFrame.mask" rel="nofollow noreferrer">^{<cd2>}</a>:</p>
<pre><code>df['D'] = df['C'].mask(df['C'] == 'Description', df['B'])
</code></pre>