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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.
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Why does the example text assign a lambda expression to a variable? This is against PEP 8 style guide IIRC and def(x) is preferred.
Wouldn't a set be technically faster to check membership than a string, because it's implimented using a hash table (in Python)? e.g. {'a', 'e', 'i', 'o', 'u'}