459. 重复的子字符串

class Solution(object):
    def repeatedSubstringPattern(self, s):
        """
        :type s: str
        :rtype: bool
        """
　　　　# 方法一：效率稍微好一些
        # n = len(s)
        # for i in range(1, n//2+1):
        #     if n % i == 0:
        #         a = s[:i]
        #         j = i
        #         while j < n and s[j:j+i] == a:
        #             j += i
        #         if j == n:
        #             return True
        # return False
        
　　　　# 方法二：效率差


        length = len(s)
        for i in range(1, length // 2 + 1):
            if s[i] == s[0] and s[:i] * (length // i) == s:
                return True
        return False