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.
Note 'If no arguments are given, ball objects should instantiate with a "ball type" of "regular."'
Hi! It's probably an issue with a string formatting you're using. I tend to avoid them, but there's a use case for everything. This post might be helpful:
http://stackoverflow.com/questions/18053500/typeerror-not-all-arguments-converted-during-string-formatting-python
If not, you can always post a code snippet marked as a spoiler and then people who have finished can take a look and possibly help advise.
Also, check that the versions of python match up. I'm pretty sure Codewars is running 2.7.3. Cheers!