擅长:python、mysql、java
<p>请尝试以下操作:</p>
<pre><code>date1=[test2[test2['product']==i].iloc[-2]['Date'] for i in test2.product.unique()]
date2=[test2[test2['product']==i].iloc[-3]['Date'] for i in test2.product.unique()]
>>>print(date1)
[201401,201402]
>>>print(date2
[202003,201903]
</code></pre>