两个年度季度之间的差异

Difference between two year-quarter in quarter

我有一个日期栏。我想获得每个日期的财政季度与最大财政季度之间的差异。我就是这样做的:

date = pd.Series(['2019-01-01', '2019-03-01', '2019-07-01', '2020-03-01'])
date = pd.to_datetime(date)
year_quarter = pd.PeriodIndex(date, freq='Q-JAN')
max_year_quarter = year_quarter.max()
print(year_quarter)
print(max_year_quarter)

输出:

year_quarter
PeriodIndex(['2019Q4', '2020Q1', '2020Q2', '2021Q1'], dtype='period[Q-JAN]', freq='Q-JAN')
max_year_quarter
Period('2021Q1', 'Q-JAN')

如果我 运行 max_year_quarter - max_year_quarter,输出将是:

Index([<5 * QuarterEnds: startingMonth=1>, <4 * QuarterEnds: startingMonth=1>,
       <3 * QuarterEnds: startingMonth=1>, <0 * QuarterEnds: startingMonth=1>],
      dtype='object')

而预期输出是:

[5, 4, 3, 0]

这是每个日期与 max_year_quarter 之间的季度数。感谢您的帮助。

这将导致季度数:

Difference = max_year_quarter - year_quarter
Difference_in_Quarter = (max_year_quarter - year_quarter).map(lambda x: x.n)

输出:

0    5
1    4
2    3
3    0
dtype: int64

使用 Period.ordinal 作为整数 repr 并通过将 PeriodIndex 的值转换为整数来减去:

Difference_in_Quarter = max_year_quarter.ordinal - year_quarter.astype(int)
print (Difference_in_Quarter)
Int64Index([5, 4, 3, 0], dtype='int64')