在列表中查找周围的数字列表Python

def find_surrounding_numbers(lst, target, radius=1):
    """
    在列表中查找目标数字周围的数字。
    
    :param lst: 列表
    :param target: 目标数字
    :param radius: 查找半径，默认为1
    :return: 包围目标数字的子列表
    """
    try:
        index = lst.index(target)
        start = max(0, index - radius)
        end = min(len(lst), index + radius + 1)
        return lst[start:end]
    except ValueError:
        return f"{target} not found in the list."

# 示例使用
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
target_number = 5
surrounding_numbers = find_surrounding_numbers(numbers, target_number, radius=2)
print(f"Numbers surrounding {target_number}: {surrounding_numbers}")