> It seems highly regular; the code here is maintaining a collection of
> row variables. Because it's so regular, you might consider using a
> list to represent this collection. Concretely:
>
> self.rows = [None, None, None, None, None, None, None, None, None, None]
Whoops. Apologies: I should have named the variable "row" to be
consistent with the rest of the message:
self.row = [None, None, None, None, None, None, None, None, None, None]
That being said, still easier just to say:
self.row = [None] * 10
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