打印所有子集与使用递归打印字符串或整数数组的所有子序列有什么不同

def print_subsequences(arr, curr_idx, curr_subseq):
    if curr_idx == len(arr):
        print(curr_subseq)
        return

    # 不选择当前元素
    print_subsequences(arr, curr_idx + 1, curr_subseq)

    # 选择当前元素
    print_subsequences(arr, curr_idx + 1, curr_subseq + [arr[curr_idx]])

# 示例调用
arr = [1, 2, 3]
print_subsequences(arr, 0, [])

[]
[3]
[2]
[2, 3]
[1]
[1, 3]
[1, 2]
[1, 2, 3]