python 判断回文数

判断一个数是不是回文数？

输入：121

输出：true

输入：123

输出：flase

三种方法如下：

class Solution:
    def isPalindrome(self, x):
        """

        :param x: int
        :return: bool
        """

        lit = list(str(x))
        L = 0
        r = len(lit) - 1
        while L <= r:
            if lit[L] != lit[r]:
                return False
            L = L + 1
            r = r - 1
        return True


s = Solution()
print(s.isPalindrome(121))

class Solution:
    def isPalindrome(self, num):
        """

        :param num: int
        :return: bool
        """
        Num = str(num)
        if Num[:] == Num[::-1]:
            return True
        else:
           return False


s = Solution()
print(s.isPalindrome(121))

class Solution(object):
    def isPalindrome(self, num):
        """

        :param num: int
        :return: bool
        """
        if num <= 0 or num % 10 == 0:
            return False
        rever = 0
        while num > rever:
            rever = rever * 10 + num % 10
            num //= 10
        return num == rever or num == rever // 10


print(Solution().isPalindrome(121))