pandas工作日计算

1. 目的

计算当天前某个工作日是哪一天，比如想看今天的前面第7个工作日是哪天。

2. pandas.tseries.offsets.BusinessDay

class pandas.tseries.offsets.BusinessDay

属性：

base

Returns a copy of the calling offset object with n=1 and all other attributes equal.

offset

Alias for self._offset.

示例：

import pandas as pd
from pandas.tseries.offsets import BusinessDay
today = pd.datetime.today()
last_offset_day = today - BusinessDay(offset)