#palindrome.py

def is_palindrome(s):
    for i in range(len(s)//2):
        if s[i] != s[-1-i]:
            return False
    return True


s = 'asdffdsa'
print(is_palindrome(s))
s = 'asdffXsa'
print(is_palindrome(s))
s = 'asdfdsa'
print(is_palindrome(s))
s = 'asdfdXa'
print(is_palindrome(s))
s = 'a'
print(is_palindrome(s))
s = ''
print(is_palindrome(s))