Leetcode:Reverse Integer Python Solution

The question:
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

Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231, 231 − 1]…