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.
Same here using keys() :)
A clever solution.
This solution would be much better if the .keys() part could be left off,
since calling the dict.keys() method is unnecessary.
if merch not in stock, which could do the same thing as if merch not in stock.keys()