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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.
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Me neither.
That's a problem with your code, not a kata issue. Read the docs, both regex_replace and g flag work.
You should alias some other column.
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Take a look at the test output. Which values differ? In which ways do they differ? Why might that be?
Also look at https://docs.python.org/3/tutorial/floatingpoint.html
you can start with easier katas (7-8 kyu) and then work your way upto higher ranked katas