I hope to get the first and last rows of each group after pandas grouping. The current method is to traverse the group for name, group in xxx: then group.iloc[0] group.iloc[-1], but this Traversing tens of millions of data is very slow. Is there any fast method?
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光陰似箭催人老，日月如移越少年。
You can use the groupbys method of DataFrame to return the first and last methods of the object to obtain it
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