It inspired by @asdfasdf，but I confuse the way to handle "]". Here's my code about 112ms:

```
class Solution(object):
def deserialize(self, s):
if s[0] != "[":
return NestedInteger(int(s))
stack = list()
i = 0
while i <len(s):
if s[i] == "[":
n = NestedInteger()
stack.append(n)
i += 1
elif s[i] == "]":
if i == len(s) - 1:
i += 1
continue
i += 1
n = stack.pop()
stack[-1].add(n)
elif s[i] == ",":
i += 1
else:
j = i
while i < len(s) and (s[i].isdigit() or s[i] == "-"):
i += 1
stack[-1].add(int(s[j:i]))
return stack[0]
```