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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.
string len in python is O(1)
I don't really like the way this exercise encourage the user to use type() to distinguish between bool and int
missing coma in comment, should be:
REPly to the request with "One <>, coming up!"
You can/should replace all your conditions with simply "if l"
Note that init and tail also work correctly with a single item list