在 python 中添加数据框的假日屋檐

Adding holiday eves on a dateframe in python

我在 Python 中有以下数据框: 日期列采用时间戳格式。

date holiday_type name other
2022-01-01 00:00:00 Holiday Holiday 1 UK
2022-01-02 00:00:00 Holiday Holiday 2 UK
2022-03-08 00:00:00 Holiday Holiday 3 UK
2022-04-12 00:00:00 Holiday Holiday 4 UK

我想为指定日期前一天的记录添加新行。生成的数据框将如下所示:

date holiday_type name other
2021-12-31 00:00:00 Pre Holiday (Pre) Holiday 1 UK
2022-01-01 00:00:00 Holiday Holiday 1 UK
2022-01-02 00:00:00 Holiday Holiday 2 UK
2022-03-07 00:00:00 Pre Holiday (Pre) Holiday 3 UK
2022-03-08 00:00:00 Holiday Holiday 3 UK
2022-04-11 00:00:00 Pre Holiday (Pre) Holiday 4 UK
2022-04-12 00:00:00 Holiday Holiday 4 UK

例外情况是,如果前一天已经是节假日,则不添加节前。

希望大家能帮帮我,谢谢

这可能是一种更有效的方法,但我是这样做的。

我创建了一个将你的日期偏移一天的数据框。然后添加后缀'(Pre) '并将holiday_type更改为'Pre Holiday'。然后我将它附加到原始数据框,排序并删除重复日期,保留最后一个条目。

import pandas as pd

cols = ['date','holiday_type','name','other']
data = [['2022-01-01 00:00:00', 'Holiday',  'Holiday 1',    'UK'],
['2022-01-02 00:00:00', 'Holiday',  'Holiday 2',    'UK'],
['2022-03-08 00:00:00', 'Holiday',  'Holiday 3',    'UK'],
['2022-04-12 00:00:00', 'Holiday',  'Holiday 4',    'UK']]



df = pd.DataFrame(data, columns=cols)
df['date'] = pd.to_datetime(df['date'])

df_yesterday = df[df['holiday_type'] == 'Holiday']
df_yesterday['date']  = df_yesterday['date'] + pd.offsets.Day(-1)
df_yesterday['holiday_type'] = 'Pre Holiday'
df_yesterday['name'] = '(Pre) ' + df_yesterday['name']

df = pd.concat([df, df_yesterday]).sort_values(['date', 'holiday_type'], ascending=[True, False]).reset_index(drop=True)
df = df.drop_duplicates(['date'], keep='last').reset_index(drop=True)

输出:

print(df)
        date holiday_type             name other
0 2021-12-31  Pre Holiday  (Pre) Holiday 1    UK
1 2022-01-01      Holiday        Holiday 1    UK
2 2022-01-02      Holiday        Holiday 2    UK
3 2022-03-07  Pre Holiday  (Pre) Holiday 3    UK
4 2022-03-08      Holiday        Holiday 3    UK
5 2022-04-11  Pre Holiday  (Pre) Holiday 4    UK
6 2022-04-12      Holiday        Holiday 4    UK