以前（营业）的日期 pandas [英] Previous (business) dates pandas

问题描述

我有一个特定日期（非连续）的 pandas.core.series.Series ，它类似于以下内容：

I have a pandas.core.series.Series of specific dates (non-consecutive) which looks like the following:

0     1998-06-09
1     1998-08-07
2     1998-09-11
3     1998-10-13
4     1998-11-03
...   
231   2019-07-25
232   2019-09-12
233   2019-10-24

这些日期不一定是工作日。我需要创建一个列表或一系列日期来表示我拥有的列表的前一天。在新列表中，每个前一天必须是一个工作日，即（假设）1998-06-09是星期一，在新列表中，我应该得到1998-06-05，即前一个星期五。有建议吗？

These dates are not necessarily business days. What I need is to create a list or series of dates which represent the previous day of the list that I have. In the new list, every previous day must be a business day, i.e. if (let's say) 1998-06-09 was a Monday, in the new list I should get 1998-06-05, i.e. the previous Friday. Any suggestions?

推荐答案

pd.offsets.BusinessDay

当您认为工作日为星期一-星期五

pd.offsets.BusinessDay

When you consider a Business Day to be Monday - Friday

df['prev_bd'] = df['Date'] - pd.offsets.BusinessDay(n=1)
        Date    prev_bd
0 2012-12-20 2012-12-19
1 2012-12-21 2012-12-20
2 2012-12-22 2012-12-21
3 2012-12-23 2012-12-21
4 2012-12-24 2012-12-21
5 2012-12-25 2012-12-24
6 2012-12-26 2012-12-25
7 2012-12-27 2012-12-26
8 2012-12-28 2012-12-27
9 2012-12-29 2012-12-28

---

pd.offsets.CustomBusinessDay

当您还想跳过假期（或特别是任何日期集）时）。这里我们不包括联邦假日，尽管您可以通过提供适当的日历来跳过任何日期。

---

pd.offsets.CustomBusinessDay

When you also want to skip holidays (or any set of dates in particular). Here we exclude Federal Holidays, though you can skip whatever dates you want by providing the appropriate calendar.

from pandas.tseries.holiday import USFederalHolidayCalendar
df['prev_nohol'] = df['Date'] - pd.offsets.CustomBusinessDay(n=1, calendar=USFederalHolidayCalendar())
#PerformanceWarning

        Date    prev_bd prev_nohol
0 2012-12-20 2012-12-19 2012-12-19
1 2012-12-21 2012-12-20 2012-12-20
2 2012-12-22 2012-12-21 2012-12-21
3 2012-12-23 2012-12-21 2012-12-21
4 2012-12-24 2012-12-21 2012-12-21
5 2012-12-25 2012-12-24 2012-12-24
6 2012-12-26 2012-12-25 2012-12-24  # Christmas skipped because Federal Holiday
7 2012-12-27 2012-12-26 2012-12-26
8 2012-12-28 2012-12-27 2012-12-27
9 2012-12-29 2012-12-28 2012-12-28

---

样本数据

import pandas as pd
df = pd.DataFrame({'Date': pd.date_range('2012-12-20', periods=10, freq='D')})

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