def get_median(self):
        l1 = len(self.min_h)
        l2 = len(self.max_h)
        m = (l1+l2-1)/2
        if (l1+l2) % 2 == 1:
            if m == 1-l2:
                return -self.max_h[0]
            else:
                return self.min_h[0]
        else:
            return (-self.max_h[0]+self.min_h[0])/2.0
dataset/ETHPy150Open algorhythms/LeetCode/295 Find Median from Data Stream.py/DualHeap.get_median/swapped operands of `-`