#0309

Check a Normalized Palindrome

EasyPython15 min10 XP

Problem

Return True if text is a palindrome after ignoring non-alphanumeric characters and case. Otherwise return False.

Why This Matters

Palindrome checks are a gentle way to learn two pointers, string cleaning, and case-insensitive comparison.

Function Signature

def is_palindrome(text):

Examples

Example 1

Inputtext = "A man, a plan, a canal: Panama"

OutputTrue

After cleaning, the text becomes amanaplanacanalpanama, which reads the same both ways.

Constraints

Return the exact requested value.
Handle edge cases cleanly.
Prefer clear Python code before clever one-liners.

CodePython

def is_palindrome(text):
    """
    Input example: text = "A man, a plan, a canal: Panama"
    Return: True
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return False

def is_palindrome(text):
    """
    Input example: text = "A man, a plan, a canal: Panama"
    Return: True
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return False

Visible browser tests run here when available.

Testcases2 visible / 3 hidden categories

Classic sentence

Input"A man, a plan, a canal: Panama"

ExpectedTrue

Spaces, punctuation, and case are ignored.

Not a palindrome

Input"race a car"

ExpectedFalse

The cleaned text raceacar does not read the same backward.

Hidden Test Categories

empty string after cleaningnumbers mixed with letterssingle character