In Raymond Hettingers Pycon 2017 Talk, What is the Database Representation

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In Raymond Hettinger's Talk he shows a representation for the index of a database. Shown below it's

[None, 4, None, 1, None, None, 0, None, 2, None, 3, None, None, None,None]

I think he explains it later in the talk but I'm having trouble putting the pieces together

While I kind of get that it contains indices to the table, what is that array and how is it generated? What does it represent? To be really specific what does 4 represent in the 1st position in the list (2nd if were not zero indexing) of the list?

Talk Screenshot Link to the Pycon Video

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