题解 | #左旋转字符串#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param str string字符串 
# @param n int整型 
# @return string字符串
#
class Solution:
    def LeftRotateString(self , str: str, n: int) -> str:
        if not str:
            return ""
        if n == 0:
            return str
        length = len(str)
        while n > length:
            n = n % length
        str1,str2 = str[:n],str[n:]
        str = str2 + str1
        return str