def is_palindrome(s):
    """ (str) -> boolean
    Returns true if the argument is a palindrome else false
    >>> is_palindrome("noon")
    True
    >>> is_palindrome("later")
    False
    >>> is_palindrome("radar")
    True
    """
    # converts (s) to lower case and assigns it to the variable word
    word = s.lower()
    return word == word[::-1]