Python3 代码

class Solution(object):
    def leftRotateString(self, s, n):
        """
        :type s: str
        :type n: int
        :rtype: str
        """
        s2 = ""

        for i in range (n, len(s)):
            s2 += s[i]

        for j in range (n):
            s2 += s[j]

        return s2