Python计算最长不重复子串

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问题：计算字符串中最长不重复子串

我的思路：

class Solution(object):
    def lengthOfLongestSubstring(self, s):
        """
        :type s: str
        :rtype: int
        """
        longtest_length = 0
        length_s = len(s)
        
        for i in range(length_s):
            sub = []
            j = i
            while j < length_s and s[j] not in sub:
                sub.append(s[j])
                j = j + 1
            sub_length = len(sub)
            if sub_length > longtest_length:
                longtest_length =  sub_length 
        
        return longtest_length