擅长:python、mysql、java
<p>IIUC,如果您只想打印每个组的数据,请使用:</p>
<pre><code>for key, group in df.groupby(['ItemId', 'Date']):
print(key)
print(group)
</code></pre>
<p>这张照片是:</p>
<pre><code>(1, '2012-04-21')
Id Timestamp Data ItemId Date
2012-04-21 19389576 2012-04-21 00:04:03.533 39.0 1 2012-04-21
2012-04-21 19389577 2012-04-21 00:04:04.870 38.5 1 2012-04-21
2012-04-21 19389608 2012-04-21 00:07:03.450 38.0 1 2012-04-21
(2, '2012-04-21')
Id Timestamp Data ItemId Date
2012-04-22 19389609 2012-04-21 00:03:04.817 37.5 2 2012-04-21
2012-04-22 19389620 2012-04-21 00:10:04.400 37.0 2 2012-04-21
</code></pre>