如何过滤掉最后一个排名？
[英]How do I filter out for last rank only?
问题描述
I have a dataset where for each unique OrderID , the status for a product changes overtime and the time for each of these changes is recorded. 
我有一个数据集，对于每个唯一的OrderID ，产品的状态随时间变化，并记录每个变化的时间。
I have grouped all the records by OrderID and ranked them. 我按OrderID对所有记录进行了分组并对它们进行了排名。 I now only want records that were the last rank for each OrderID . 我现在只想要每个OrderID的最后一个等级的记录。
Grouped = sortedOrdersAll.sort_values(['ordid','DateTime'],ascending=True).groupby(['ordid','DateTime'])
Grouped.first()
1 个解决方案
解决方案1
0 已采纳 2019-05-17 12:41:39
没有使用groupby，我认为你可以做到这一点
df.sort_values('DateTime').drop_duplicates(subset=['ordid'], keep='last')
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