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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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It doesn't actually want you to return "Negative numbers cannot be square numbers" , it wants you to return False for negative numbers. The string you saw for the test case is the optional argument which will output a message if the user gets the wrong answer. Silly mistake ;)
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Can you mark this as resolved please. Thanks.
No problem dude.
You need to return the value instead of printing it. All katas work like this for future reference :)