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I know this reply arrived wayyyy too late but maybe it’ll help for future learners:
I think “None” here represents a default value or an “empty slot” in our array, which can be filled with data later. And we put it in range(self.array_size) because we can’t have more emty slots than the size of our array.
That’s how I understand this
I don’t think these lessons make it clear enough that Python is being used as merely as a tool to illustrate how this data-structure functions. I would suggest a more clear statement at the outset, such as “in Python, efficient key-value storage via hash-maps is already accomplished via the built in dictionary Data-Type, that you will already have learned about by now. For that reason, this exercise is focusing on teaching you the general principles of how hash-maps may be implemented across different programming languages. In practice with Python, you’ll likely want to use the built-in dictionary class for most purposes.”
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