处理输入值的数组

def safe_access(arr, index):
    if 0 <= index < len(arr):
        return arr[index]
    else:
        raise IndexError("Index out of range")

def remove_duplicates(arr):
    return list(set(arr))

arr = [3, 1, 4, 1, 5, 9, 2]
sorted_arr = sorted(arr)
print(sorted_arr)  # 输出: [1, 1, 2, 3, 4, 5, 9]

def linear_search(arr, target):
    for i in range(len(arr)):
        if arr[i] == target:
            return i
    return -1

def insert_element(arr, index, element):
    arr.insert(index, element)

def remove_element(arr, index):
    del arr[index]

def process_array(arr):
    # 安全访问
    try:
        print(safe_access(arr, 5))
    except IndexError as e:
        print(e)

    # 去重
    unique_arr = remove_duplicates(arr)
    print("Unique array:", unique_arr)

    # 排序
    sorted_arr = sorted(arr)
    print("Sorted array:", sorted_arr)

    # 查找
    index = linear_search(arr, 4)
    print("Index of 4:", index)

    # 插入和删除
    insert_element(arr, 2, 10)
    print("After insertion:", arr)
    remove_element(arr, 3)
    print("After deletion:", arr)

# 测试数组
test_arr = [3, 1, 4, 1, 5, 9, 2]
process_array(test_arr)