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我有一個包含數據的數據框,我希望計算出時間內數值的變化。計算大熊貓中列的變化
UserId DateTime Value
1 1 0
1 2 0
1 3 0
1 4 1
1 6 1
1 7 1
2 1 0
2 2 1
2 3 1
2 4 0
2 6 1
2 7 1
所以腳本執行後,我想變革標識(用戶和日期)列。只有從0到1的變化纔有意思。
UserId DateTime Value IsChanged
1 1 0 0
1 2 0 0
1 3 0 0
1 4 1 1 <- Value was changed from 0 to 1
1 6 1 0
1 7 1 0
2 1 0 0
2 2 1 1 <- Value was changed from 0 to 1
2 3 1 0
2 4 0 0 <- Change from 1 to 0 not interesting
2 6 1 1 <- Value was changed from 0 to 1 for the user
2 7 1 0