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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.
For simple statements like this, it's quite pythonic to put it on one line. Even for more complicated statements with ifs and for loops and generators, it is still often pythonic to put it on one line.
YMMV in other languages.
I don't know about industrial programming, but here it is often done like this