Palindrome String Method | Dataford Interview Questions

In QA checks for Finastra FusionFabric.cloud, reference strings may contain spaces, punctuation, and inconsistent capitalization. Implement a method that determines whether a string is a palindrome after ignoring non-alphanumeric characters and comparing letters without regard to case.

Formal Specification

Given a string s, return True if the sequence of alphanumeric characters reads identically from left to right and right to left after case normalization. Return False otherwise. An empty string, or a string containing no alphanumeric characters, is considered a palindrome.

Use Python's str.isalnum() to identify alphanumeric characters and str.lower() for case-insensitive comparison. The input is one string, and the output is a Boolean.

Constraints

1 <= len(s) <= 2 * 10^5
s contains printable or Unicode characters
Comparison is case-insensitive
Non-alphanumeric characters must be ignored

Function Signature

def is_palindrome(s):

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