125. Valid Palindrome

원문: https://doljae.tistory.com/160

[Valid Palindrome - LeetCode

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leetcode.com](https://leetcode.com/problems/valid-palindrome/)

1. isalnum()

class Solution:
    def isPalindrome(self, s: str) -> bool:
        stack = []
        for char in s:
            if char.isalnum():
                stack.append(char.lower())

        if len(stack) % 2 == 1:
            return stack[:len(stack) // 2] == stack[len(stack) // 2 + 1:][::-1]
        else:
            return stack[:len(stack) // 2] == stack[len(stack) // 2:][::-1]

건질 만한 건 isalnum() 정도?...