Simple palindrome
Input
'racecar'
Output
True
The string "racecar" reads the same forwards and backwards.
Full lesson preview
Is Palindrome String
Determine whether a string reads the same forwards and backwards, ignoring non-alphanumeric characters and case.
Python practice8 minControl Flow (If–Else Logic)BeginnerLast updated March 15, 2026
Problem statement
Write a function is_palindrome(s) that returns True if the input string s is a palindrome when considering only alphanumeric characters and ignoring case; otherwise return False. An empty string (or a string with no alphanumeric characters) should be considered a palindrome.
Task
Practice conditional logic and simple string processing to detect palindromes.
Examples
Input format
A single string argument s.
Output format
Return True if s is a palindrome (ignoring non-alphanumerics and case), otherwise False.
Constraints
Do not use external libraries. Handle empty strings and strings with punctuation.
Samples
Sample 1
Input
"A man a plan a canal Panama"
Output
True
Ignoring spaces and case, it's a palindrome.