Leetcode 7. Reverse Integer

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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.

Answer:

class Solution(object):
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        xstr=str(x)
        result=0
        if xstr[0]=='-':
            result= int('-'+''.join(list(reversed(xstr[1:]))))
        else:
            result= int(''.join(list(reversed(xstr))))
        if result<-2**31 or result>2**31-1:
            return 0
        else:
            return result