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]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

This is a Leetcode easy level interview problem. The best and easiest way to approach this problem is through the use of strings.

Here is a step by step approach of the solution:

Step 1: Create a variable and convert the integer into a string by storing the absolute value. Strip all the leading zeros and then reverse the string. Afterwards store the output as an integer.

def reverse_integer(n):
   y = str(abs(n))
   y = y.strip()
   y = y[::-1]
   output = int(y)

Step 2: Check if the output is in the range or not. If it is overflown return zero.

if output >= 2** 31 -1 or output <= -2** 31: