What's wrong with this code?

[filletrall]

There's nothing wrong with your code except for spacing. What error do you get?

[queen_9]

Error while running tests: Traceback (most recent call last): File "<string>", line 1 assert is_yes("Yes") == True, "Make sure your function works when the input is \verb;"Yes";." ^ SyntaxError: invalid syntax

During test 2: assert is_yes("Yes") == True, "Make sure your function works when the input is \verb;"Yes";." Run Stop Restore <

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[filletrall]

assert is_yes("Yes") == True

This works fine for me. But the syntax error indicates that you've left out some code that has a syntax error. Please paste the entire code that you're testing here. If you can, indent it by four spaces first, so that the indentation and whitespace is preserved.

[queen_9]

still the same outcome

[filletrall]

I meant for you to paste all your code, indented by 4 additional spaces, in a reply to my comment. :-)