[LeetCode] 125. Valid Palindrome

https://leetcode.com/problems/valid-palindrome/

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

For example,
"A man, a plan, a canal: Panama" is a palindrome.
"race a car" is not a palindrome.

Note:
Have you consider that the string might be empty? This is a good question to ask during an interview.

For the purpose of this problem, we define empty string as valid palindrome.

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只考慮字母的並驗證 一串字串是不是 回文字串.

class Solution(object):

    def isPalindrome(self, s):

        s = str(s)

        temp = filter(str.isalnum,  s.lower())  // 只考慮字母 並全部轉小寫

        i = 0

        j = len(temp)-1

        while( i <= j ):                                   // 從前後 雙pointer 掃

            if temp[i] == temp[j] :

                i += 1

                j -= 1

                pass

            else:

                return False

        return True