9_Palindrome_Number.py

"""
9. Palindrome Number:

Given an integer x, return true if x is a
palindrome
, and false otherwise.

 

Example 1:

Input: x = 121
Output: true
Explanation: 121 reads as 121 from left to right and from right to left.

Example 2:

Input: x = -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Example 3:

Input: x = 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
"""

class Solution(object):
    def isPalindrome(self, x):
        """
        :type x: int
        :rtype: bool
        """
        reverse = 0
        if (x < 0) or (x % 10 == 0 and x != 0):
            return False
        else:
            while (x > reverse):
                reverse = reverse*10 + x%10
                x /= 10
        
            return x == reverse or x== reverse/10