leetcode 125. Valid Palindrome

def isPalindromic(s):
    ans=False
    convertedS=''
    for i in s:
        i=i.lower()
        #i=i.replace(" ",'')
        if i.isalnum(): convertedS+=i
    sLength=len(convertedS)
    if sLength%2==0:
        if convertedS[:sLength//2] ==convertedS[sLength//2:][::-1] :ans=True
    else:
        if convertedS[:sLength//2] ==convertedS[sLength//2+1:][::-1] :ans=True
    return ans
class Solution:
    def isPalindrome(self, s: str) -> bool:
        return isPalindromic(s)