LeetCode Valid Palindrome Python
2015-03-28 19:02
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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.
class Solution: # @param s, a string # @return a boolean def isPalindrome(self, s): ls = [i.lower() for i in s if i.isalnum()] l = len(ls) tmp1 = ls[:l/2] tmp2 = list(reversed(ls[l/2:] if l%2==0 else ls[l/2+1:])) return True if tmp1==tmp2 else False
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