Thinking...
Okay, I need to write a Python function called is_palindrome that returns T
True if the string s is a palindrome. Let me think about how to approach th
this.
First, what's a palindrome? Oh right, a string that reads the same forwards
forwards and backwards. So for example, "abba" or "madam". But how do I
check that in code?
Hmm, the straightforward way is to compare the string with its reverse. So
for s in the function, I can take the reverse of s and check if it's equal.
equal. That's simple enough. But wait, what about edge cases? Like empty st
strings? Oh, but according to the problem statement, maybe the test cases d
don't include empty strings, but I should handle them as well.
Wait, the problem says "One test case." So maybe the function needs to be c
called with some sample input. Let me think of a test case. Let's say s is
"racecar". Then the function should return True. Another example: "123"
would return False. Also, what about "a"? It's a palindrome. So the code sh
should handle these cases.
So the steps are: reverse the string and check if it's equal. How to
reverse in Python? Well, s[::-1] would reverse the string. So the function
could be:
def is_palindrome(s):
return s == s[::-1]
Wait, but what if s is empty? Like empty string. Then s[::-1] is also
empty, so it would return True. Which is correct. So that's correct.
Testing with some examples. Let's see:
If s is "a", then s[::-1] is "a", so True. If s is "ab", then reversed is "
"ba", so False. That's right.
What about a string with non-alphanumeric characters? Like "A1a". Then
reversed would be "a1A", which is not equal to the original. So returns
False. Correct.
So this function seems to handle all cases. So the code is straightforward.
straightforward. Now, the problem says to write this function, and one test
test case. So maybe I can write the function and then test it.
Wait, but what if the input is not a string? Like if s is a number? But
according to the problem statement, the function is supposed to take a
string. So maybe the input s is a string. So perhaps the function is called
called with a string s, and the code is written to handle it.
Therefore, the function is_palindrome(s) as described returns True if s is
a palindrome. So the code is as I wrote. So the answer is to write that
function.
...done thinking.
```python
def is_palindrome(s):
return s == s[::-1]
# Test case
print(is_palindrome("abba")) # Output: True
print(is_palindrome("madam")) # Output: True
print(is_palindrome("123")) # Output: False
print(is_palindrome("a")) # Output: True
print(is_palindrome("")) # Output: True
```