python - 从星期五开始创建一周

Question

我有一个日期列。我如何获得从星期五开始的一周？

df    date          
0   2016-01-01     
1   2016-01-02     
...

预期产出

df    date          week
0   2016-01-01     2016-01-01
1   2016-01-02     2016-01-01

df['week'] = df.date - pd.offsets.Week(weekday=4)

Answer 1

使用to_period：

df['week'] = df.date.dt.to_period('W-THU')
df['first_day'] = df['week'].dt.start_time

输出：

   df       date                   week  first_day
0   0 2016-01-01  2016-01-01/2016-01-07 2016-01-01
1   1 2016-01-02  2016-01-01/2016-01-07 2016-01-01