125. Valid Palindrome

class Solution:
    def isPalindrome(self, s):
        """
        :type s: str
        :rtype: bool
        """
        if s == "":
            return True
        else:
            new_string = s
            new_string = new_string.lower()
            new_list = []
            for i in new_string:
                if (ord(i) >= 97 and ord(i) <= 122) or (ord(i) >= 48 and ord(i) <= 57):
                    new_list.append(i)
            new_string = ("").join(new_list)
            print (new_string)
            if new_string == new_string[::-1]:
                return True
            else:
                return False