在数组中获取键周围的数字

def get_surrounding_numbers(arr, key):
    prev = arr[key - 1] if key > 0 else None
    current = arr[key]
    next = arr[key + 1] if key < len(arr) - 1 else None
    return prev, current, next

# 示例数组
array = [1, 2, 3, 4, 5]

# 获取索引2周围的数字
prev_num, current_num, next_num = get_surrounding_numbers(array, 2)
print(f"Previous: {prev_num}, Current: {current_num}, Next: {next_num}")

def get_surrounding_numbers(arr, key):
    if key < 0 or key >= len(arr):
        raise IndexError("Index out of bounds")
    prev = arr[key - 1] if key > 0 else None
    current = arr[key]
    next = arr[key + 1] if key < len(arr) - 1 else None
    return prev, current, next

def get_surrounding_numbers(arr, key):
    if not arr:
        raise ValueError("Array is empty")
    if key < 0 or key >= len(arr):
        raise IndexError("Index out of bounds")
    prev = arr[key - 1] if key > 0 else None
    current = arr[key]
    next = arr[key + 1] if key < len(arr) - 1 else None
    return prev, current, next