Reverse Integer Python

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output: 321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231,  231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

class Solution:

    def reverse(self, x: int) -> int:

        sign = -1 if x < 0 else 1

        x *= sign

        res = 0

        while x > 0:

            res = (res * 10) + x % 10

            x = x // 10

        res*=sign

        return res if abs(res) <= (2 ** 31) else 0

            

Space Complexity : O(1)

Time Complexity : O(n)