Problem 7 : Reverse Integer

题目描述：

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.

代码：

class Solution:
    def reverse(self, x: int) -> int:
        x = -int(str(x)[::-1][:-1]) if x < 0 else int(str(x)[::-1])
        x = 0 if abs(x) > 0x7FFFFFFF else x

        return x

if __name__ == '__main__':
    sol = Solution()
    y = sol.reverse(-12389)
    print(y)