offsets.py 文件源码

def apply(self, other):
        if isinstance(other, datetime):
            n = self.n

            if n == 0 and other.weekday() > 4:
                n = 1

            result = other

            # avoid slowness below
            if abs(n) > 5:
                k = n // 5
                result = result + timedelta(7 * k)
                if n < 0 and result.weekday() > 4:
                    n += 1
                n -= 5 * k
                if n == 0 and result.weekday() > 4:
                    n -= 1

            while n != 0:
                k = n // abs(n)
                result = result + timedelta(k)
                if result.weekday() < 5:
                    n -= k

            if self.offset:
                result = result + self.offset
            return result

        elif isinstance(other, (timedelta, Tick)):
            return BDay(self.n, offset=self.offset + other,
                        normalize=self.normalize)
        else:
            raise ApplyTypeError('Only know how to combine business day with '
                                 'datetime or timedelta.')