Paginate a list in Python
Python interview exercise on Practical, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write paginate(items, page, size) that returns the items on a 1-based page. A page past the end is empty, and so is a page or size below 1. A negative slice index counts from the end, so rule those out first.
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