Perform String Shifts Python

You are given a string s containing lowercase English letters, and a matrix shift, where shift[i] = [direction, amount]:

• direction can be 0 (for left shift) or 1 (for right shift). 
• amount is the amount by which string s is to be shifted.
• A left shift by 1 means remove the first character of s and append it to the end.
• Similarly, a right shift by 1 means remove the last character of s and add it to the beginning.

Return the final string after all operations.

Example 1:

Input: s = "abc", shift = [[0,1],[1,2]]
Output: "cab"
Explanation: 
[0,1] means shift to left by 1. "abc" -> "bca"
[1,2] means shift to right by 2. "bca" -> "cab"

class Solution:

    def stringShift(self, s: str, shift: List[List[int]]) -> str:

        l,ls,rs = len(s),0,0

        for direction , amount in shift:

            if direction == 0:

                ls+=amount

            else:

                rs+=amount

        ls = ls % l

        rs = rs % l

        if ls == rs:

            return s

        elif ls > rs:

            ls = ls -rs

            return s[ls:]+s[:ls]

        else:

            rs = rs -ls

            return s[-rs:]+s[:-rs]