leetcode-面58 左旋转字符串 Python

方法一：

class Solution:
    def reverseLeftWords(self, s: str, k: int) -> str:
        return s[k:]+s[:k]

方法二:

class Solution:
    def reverseLeftWords(self, s: str, k: int) -> str:
        n = len(s)
        s = s + s
        return s[k:n + k]

方法三：

class Solution:
    def reverseLeftWords(self, s: str, k: int) -> str:
        n = len(s)
        res = ''
        for i in range(k, k+n):
            res += s[i%n]
        return res