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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.
I can't submit this kata, because:
STDERR
Traceback (most recent call last):
File "tests.py", line 18, in
static ("Avoid success at all costs!")
File "tests.py", line 10, in static
test.assert_equals(rot13(d),sol(d))
File "/workspace/default/solution.py", line 9, in rot13
res.append(alf[i])
KeyError: ' '