human
Solve in Python:
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.

Example 1:

Input: "babad"
Output: "bab"
Note: "aba" is also a valid answer.

Example 2:

Input: "cbbd"
Output: "bb"
assistant
#Here is Python code to find the longest palindromic substring in s.

class Solution:
     def longestPalindrome(self, s):
         """
         :type s: str
         :rtype: str
         """
         if len(s) == 0:
             return 0
         start = 0
         maxlength = 1
         for i in range(len(s)):
             if i - maxlength  - 1 >= 0 and s[i-maxlength-1:i+1] == s[i-maxlength-1:i+1][::-1]:
                 start = i-maxlength-1
                 maxlength+=2
             if i-maxlength>=0 and s[i-maxlength:i+1]==s[i-maxlength:i+1][::-1]:
                 start = i-maxlength
                 maxlength+=1
         return s[start:start+maxlength]