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题目：
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.
class Solution(object): def isPalindrome(self, s): """ :type s: str :rtype: bool """ if s=='': return True i = 0; j = len(s)-1 while i
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