Even-Length String Logic

EasyPython

Problem

Insurity policy workflows may need a deterministic string transformation before displaying or processing values in ClaimsXPress. Implement a function that examines the length of an input string and returns the original string when its length is even, or the characters in reverse order when its length is odd.

The transformation must preserve every character, including spaces, punctuation, digits, and letter case. The parity decision must use Python's standard string length, so each Unicode code point contributes one to the length.

Formal Specification

Input: s, a non-null Python str.
Output: A Python str containing either the original value or its reversal.
If len(s) % 2 == 0, return s unchanged.
Otherwise, return s reversed.
Do not modify the input string. Python strings are immutable, so returning a new reversed string is acceptable.

Constraints

0 <= len(s) <= 10^5
s is a non-null Python string
s may contain Unicode characters, whitespace, punctuation, and digits
The input string must not be modified

Function Signature

def transform_policy_string(s):

Formal Specification

Input: s, a non-null Python str.
Output: A Python str containing either the original value or its reversal.
If len(s) % 2 == 0, return s unchanged.
Otherwise, return s reversed.
Do not modify the input string. Python strings are immutable, so returning a new reversed string is acceptable.