Loading collection data...
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.
well, you have to
return None
not "None"
dont use brackets around None
I don't understand why its incorrect that when the input is None, return what it is
and the message appreas 'None' should equal None.
Could anyone give me some advice?
I don't know why that I passed the sample test but failed when I attempt the code even they use the same test.
Does this issue happen on someone else ?