如何查找两个范围内的重叠值

def find_overlap(range1_start, range1_end, range2_start, range2_end):
    if range1_end < range2_start or range1_start > range2_end:
        # 两个范围没有重叠
        return None
    else:
        # 计算重叠部分的起始值和结束值
        overlap_start = max(range1_start, range2_start)
        overlap_end = min(range1_end, range2_end)
        # 计算重叠部分的长度或者重叠的数值范围
        overlap_length = overlap_end - overlap_start + 1
        return overlap_length

# 示例用法
range1_start = 1
range1_end = 10
range2_start = 5
range2_end = 15

overlap_length = find_overlap(range1_start, range1_end, range2_start, range2_end)
if overlap_length is not None:
    print("两个范围的重叠长度为:", overlap_length)
else:
    print("两个范围没有重叠")