Pandas与日期值的差异

Question

如果我有这样的DataFrame

Date           value
04 May 2015     1
06 May 2015     1
07 May 2015     1
11 May 2015     1
11 May 2015     1

如何获得日期索引的差异？即下面的第三个栏目：

Date           value   Diff
04 May 2015     1      NA
06 May 2015     1       2
07 May 2015     1       1
11 May 2015     1       4
11 May 2015     1       0

Answer 1

你的意思是：

df["Diff"] = df.index
df["Diff"] = (df['Diff'] - df['Diff'].shift())

print(df)
            value   Diff
Date                    
2015-05-04      1    NaT
2015-05-06      1 2 days
2015-05-07      1 1 days
2015-05-11      1 4 days
2015-05-11      1 0 days

Answer 2

您可以使用pandas.Series.diff

>>> df['diff_in_days'] = df.index.to_series().diff()

            value   Diff
Date                    
2015-05-04      1    NaT
2015-05-06      1 2 days
2015-05-07      1 1 days
2015-05-11      1 4 days
2015-05-11      1 0 days