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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.
You described what the try except block does which is correct. However, it does not answer @shbhmnk's question of the case when a number cannot be turned into a string.
Why is the try statement neccessary here? Do you have any particular case in mind?