class Solution(object):

    def isPalindrome(self, s):

        """

        :type s: str

        :rtype: bool

        """

        res = ''

        s = s.lower()

        alphanum = string.ascii_lowercase + string.digits

        for i in s:

            if i in alphanum:

                res += i

        return res == res[::-1]

class Solution(object):

    def isPalindrome(self, s):

        """

        :type s: str

        :rtype: bool

        """

        res = s = [i for i in s if i != ' ']

        print(s)

        res.reverse()

        print(s)

        print(res)

        return res == s

class Solution(object):

    def isPalindrome(self, s):

        """

        :type s: str

        :rtype: bool

        """

        s="".join(e for e in s if e.isalnum()).lower()

        return s == s[::-1]