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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.
I was being Pythonic when I wrote this. I would agree that x!=0 is more readable. https://docs.python-guide.org/writing/style/
It could equally have been used and would have been more readable IMO. As to why it was not? Perhaps the author preferred a shorter solution, or perhaps they find it just as readable, perhaps perhaps perhaps...
It is part of the loop, and it filters all
xthat are not a falsy value (0, False, empty string, etc). Look up list comprehension for more details.