Question

我正在尝试使用Python 3.6中的静态方法创建一个类USTradingCalendar。

问题：但是当我尝试调用静态方法get_trading_close_holidays()时，出现错误

AttributeError: 'datetime.datetime' object has no attribute 'rules'

出了什么问题？任何帮助表示赞赏！

import datetime as dt
from helpers import str2date

from pandas.tseries.holiday import AbstractHolidayCalendar, Holiday, nearest_workday, \
    USMartinLutherKingJr, USPresidentsDay, GoodFriday, USMemorialDay, \
    USLaborDay, USThanksgivingDay


class USTradingCalendar(AbstractHolidayCalendar):
    rules = [
        Holiday('NewYearsDay', month=1, day=1, observance=nearest_workday),
        USMartinLutherKingJr,
        USPresidentsDay,
        GoodFriday,
        USMemorialDay,
        Holiday('USIndependenceDay', month=7, day=4, observance=nearest_workday),
        USLaborDay,
        USThanksgivingDay,
        Holiday('Christmas', month=12, day=25, observance=nearest_workday)
    ]


    @classmethod
    def get_trading_close_holidays(cls, year):
        return cls.holidays(dt.datetime(year-1, 12, 31), dt.datetime(year, 12, 31))



if __name__ == '__main__':
    print(USTradingCalendar.get_trading_close_holidays(2016))

回溯：

Traceback (most recent call last):
  File "tradingCalendar.py", line 37, in <module>
    print(USTradingCalendar.get_trading_close_holidays(2016))
  File "tradingCalendar.py", line 32, in get_trading_close_holidays
    return cls.holidays(dt.datetime(year-1, 12, 31), dt.datetime(year, 12, 31))
  File "C:\Users\y\Anaconda2\envs\test\lib\site-packages\pandas\tseries\holiday.py", line 376, in holidays
    if self.rules is None:
AttributeError: 'datetime.datetime' object has no attribute 'rules'

Answer 1

holidays()需要AbstractHolidayCalendar类型的参数，因此请将其更改为：

@classmethod
def get_trading_close_holidays(cls, year):
    return cls.holidays(USTradingCalendar(), dt.datetime(year-1, 12, 31), dt.datetime(year, 12, 31))

Python静态方法中的AttributeError

1 个答案: