Fun kata, but should include better definition of how to handle punctuation -- is matching '.' and ',' required to qualify as a match? Would be nice to include that in the instructions, and ideally test cases as well.

Should probably include a test case or two to get people started

Practially, it doesn't make any difference. The init method automatically returns none, so you don't need to include that instruction in your code. The 'pass' keyword does nothing, it is basically just a placeholder to keep Python from getting angry that you didn't include an indented block in the init method. If you used an empty return, or return None, you'd get the same results, you're just doing a little more work than you need to.

Too much data entry required

This is a fair requirement, but should it be mentioned as part of the instructions, or be visible in the user-facing test suite? If there are specific requirements around exception handling, I think the user should be able to see them.