在python中向字典添加新键和值时出现字典可变性问题

Question

我正在尝试从我传递的python列表中找到最长的递增子序列。最终的字典结构应如下所示：

Expected structure
subsequence_dict={ 0:[15], 1:[15,27], 2:[14],3:[15,27,38],4:[14,26],5:[15,27,38,55],6:[15,27,38,46],7:[15, 27, 38, 55, 65, 85]}

Output:
{0: [15, 27, 38, 55, 65, 85], 1: [15, 27, 38, 55, 65, 85], 2: [14, 26, 46], 3: [15, 27, 38, 55, 65, 85], 4: [14, 26, 46], 5: [15, 27, 38, 55, 65, 85], 6: [14, 26, 46], 7: [15, 27, 38, 55, 65, 85], 8: [15, 27, 38, 55, 65, 85]}

在我的输出中查看键0时，看起来存在一些可变性问题。

对于主函数中i的每个值，字典中应该有一个新键，该键的值来自longest_subsequence函数。

from copy import deepcopy
def longest_subsequence(dict_elent,subsequence_dict):
    """

    :param dict_elent: Dictionary element to which the longest list last element to be compared
    :param subsequence_dict: 
    :return:  List 
    """
    x=subsequence_dict.values()
    sorted_list = sorted(x, reverse=True)
    flag=False
    for sublist in sorted_list:
        if sublist[-1]<dict_elent:
            sublist.append(dict_elent)
            flag=True
            break
    if flag==True:
        return  sublist
    else:
        return [dict_elent]


def main(d,subsequence_dict):
    for i in range(len(d)):
        if i==0 :
            subsequence_dict[i]=[d[i]]
        else:
            subsequence_dict.update({i: longest_subsequence(d[i],subsequence_dict)})

if __name__ == '__main__':
    d=[15,27,14,38,26,55,46,65,85]
    subsequence_dict={}
    main(d,subsequence_dict)
    print(subsequence_dict)