String - 125. Valid Palindrome

#===================================
# Tanzila Islam
# Email: tanzilamohita@gmail.com
# Language: Python 3
#===================================
class Solution:
    def isPalindrome(self, s: str) -> bool:
        mod_string = ""
        for elem in s:
            if elem.isalnum():
                mod_string += elem

        if mod_string.lower() == mod_string.lower()[::-1]:
            return 1
        else:
            return 0