Given a string, verify that it is a palindrome string. Only alphanumeric characters are considered, regardless of the case of the letters.

class Solution(object):
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        s =  filter(str.isalnum, str(s)).lower()

        if s == s[::-1]:

            return True
        else:
            return False
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