offsets.py 文件源码

def __init__(self, n=1, normalize=False, **kwds):
        self.n = n
        self.normalize = normalize
        self.startingMonth = kwds['startingMonth']
        self.weekday = kwds["weekday"]

        self.variation = kwds["variation"]

        self.kwds = kwds

        if self.n == 0:
            raise ValueError('N cannot be 0')

        if self.variation not in ["nearest", "last"]:
            raise ValueError('%s is not a valid variation' % self.variation)

        if self.variation == "nearest":
            weekday_offset = weekday(self.weekday)
            self._rd_forward = relativedelta(weekday=weekday_offset)
            self._rd_backward = relativedelta(weekday=weekday_offset(-1))
        else:
            self._offset_lwom = LastWeekOfMonth(n=1, weekday=self.weekday)