擅长:python、mysql、java
<p>使用<a href="https://numpy.org/doc/stable/reference/generated/numpy.where.html" rel="nofollow noreferrer">^{<cd1>}</a>和<a href="http://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.isin.html" rel="nofollow noreferrer">^{<cd2>}</a>作为矢量化快速解决方案:</p>
<pre><code>portfoy['PRODUCT_TYPE'] = np.where(portfoy['PRODUCT_CODE'].isin([3, 5, 8]), 'old', 'new')
</code></pre>