python pandas:从会计年度和月份中获得会计季度(对于英国) [英] python pandas: get fiscal quarter from fiscal year and month (for UK)

问题描述

我有一个带有两个有用列的数据框:1)会计年度，2)日期.我想添加一个新列来显示财政季度.

I have a dataframe with two useful columns 1) fiscal year, 2) date. I want to add a new column which shows the fiscal quarter.

仅供参考-英国财政年度为4月1日至3月31日

FYI - UK Financial year runs from 1 April to 31 March

我的数据如下:

    fiscal year  date
    FY15/16      2015-11-01
    FY14/15      2014-10-01
    FY15/16      2016-02-01

我希望它看起来像这样:

I want it to look like this:

    fiscal year  date        Quarter
    FY15/16      2015-11-01  q3
    FY14/15      2014-10-01  q3
    FY15/16      2016-02-01  q4

真的希望我能找到正确的住所！

Really hope I got the quarters right!

下面的代码有效，但我相信它会返回美国的金融季度，但我想要英国.

Code below works but I believe it returns American financial quarters but I want UK.

df['Quater'] = df['Date'].dt.quarter 

推荐答案

import pandas as pd
df = pd.DataFrame({'date': ['2015-11-01', '2014-10-01', '2016-02-01'],
                   'fiscal year': ['FY15/16', 'FY14/15', 'FY15/16']})
df['Quarter'] = pd.PeriodIndex(df['date'], freq='Q-MAR').strftime('Q%q')
print(df)

收益

         date fiscal year Quarter
0  2015-11-01     FY15/16      Q3
1  2014-10-01     FY14/15      Q3
2  2016-02-01     FY15/16      Q4

---

默认的季度频率Q等效于Q-DEC.

---

The default quarterly frequency Q is equivalent to Q-DEC.

In [60]: pd.PeriodIndex(df['date'], freq='Q')
Out[60]: PeriodIndex(['2015Q4', '2014Q4', '2016Q1'], dtype='int64', freq='Q-DEC')

Q-DEC指定每个季度的季度，其最后一个季度在12月的最后一天结束. Q-MAR指定每个季度的季度，其最后一个季度在三月的最后一天结束.

Q-DEC specifies quarterly periods whose last quarter ends on the last day in December. Q-MAR specifies quarterly periods whose last quarter ends on the last day in March.

In [86]: pd.PeriodIndex(df['date'], freq='Q-MAR')
Out[86]: PeriodIndex(['2016Q3', '2015Q3', '2016Q4'], dtype='int64', freq='Q-MAR')

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