Leetcode study day 2

Leetcode  · 

Problem: Reverse integer

My solution:

class Solution(object):
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        if x < 0:
            sign = "-"
        else:
            sign = "+"
        x = [char for char in str(x) if char != "-" and char != "+"]
        x = int(sign + "".join(x[::-1]))
        
        if x < -2**31 or x > (2**31 - 1):
            return 0
        
        return x

A better solution:

class Solution:
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        sign = [1,-1][x < 0]
        rst = sign * int(str(abs(x))[::-1])
        return rst if -(2**31)-1 < rst < 2**31 else 0