验证字符串是否为回文串125

class :
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        s = ''.join(e for e in s.lower() if e.isalnum())
        if s:
            half_len = len(s) // 2 + 1
            for index in range(half_len):
                if s[index] != s[len(s) - 1 - index]:
                    return False
        return True

s =  "race a car"
print(Solution().isPalindrome(s))
print(string.punctuation)