Valid Palindrome String Check

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Your question is Valid Palindrome String Check. Start with the requirements on the right.

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Problem

Given a string s, return true if it is a palindrome and false otherwise. A palindrome reads the same forward and backward. For this problem, compare characters case-insensitively and ignore all non-alphanumeric characters.

Constraints

0 <= len(s) <= 2 * 10^5
s may contain uppercase letters, lowercase letters, digits, spaces, and punctuation
The solution should run in linear time

Function Signature

def is_palindrome(s):

Your solutionPython 3

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