You didn't fully understand the problem

You need to return, not display to the console/screen

Thank you very much, @hobovsky, for a very complete and clear explanation!

I also join the question why not explicitly return False, instead of "falsy"-value?

It would look like a good practice.

I really liked this kata, but for the first couple of minutes I was trying to figure out what false-y was in the description and in the test-cases.
Could it be a typo?

Maybe it would be better:

Anything else such as False, 0, [], "" as input, sholud return False

P.s: I apologize if i don't understand the terminology (or slang?) i'm not from an English-speaking country :-)

Hi)

I didn't find the right button either, but my avatar changed after I linked up the github (Account settings-->Social-->Link your github)
Now my avatar from github)