Palindrome Number

class Solution {
public:
    bool isPalindrome(int x) {
        if(x < 0) return false;
        long long y = 0, tmp = x;
        while(tmp > 0) {
            y = y * 10 + tmp % 10;
            tmp /= 10;
        }
        return x == y;
    }
};

class Solution(object):
    def isPalindrome(self, x):
        return str(x)[::-1] == str(x)