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Days since the previous purchase

Rows are sorted by user and date. Which line gives the number of days since each user's previous purchase?

A.df["date"].diff().dt.daysB.df.groupby("user")["date"].shift().dt.daysC.df.groupby("user")["date"].diff().dt.daysD.(df["date"] - df["date"].min()).dt.days

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Days since the previous purchase

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