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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.
Get started now by creating a new collection.
Not a kata issue. And it's not hidden, see the error message.
try it with fullmatch, see my post above yours.
Wrong output for '1234': True should equal False
Wrong output for '098765': True should equal False
passed all except for these two, seems to me they should both be true.
spoiler, yes it was a hiden char of some sort showing up. most likely a newline, but why?