动态规划 easy, 但是速度好像比较慢

`

class Solution:

def is_palindrome(self, s):

return s[::-1] == s

def partition_2(self, s, index, result_dict):
tmp = []
for i in range(0, index + 1):
if self.is_palindrome(s[i:index+1]):
# for j in result_dict[i-1]:
# tmp.append(j + [s[i:index+1]])
tmp.extend([j + [s[i:index+1]] for j in result_dict[i-1]])
result_dict[index] = tmp

def partition(self, s: str) -> List[List[str]]:
if not s:
return [[]]
result_dict = {}
result_dict[-1] = [[]]
# if len(s) == 1:
# return [[s]]
# result_dict[0] = [[s]]
for i in range(0, len(s)):
self.partition_2(s, i, result_dict)
return result_dict[len(s) - 1]`