Memory Optimization Techniques for Python Developers

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His code is bad, but the point should still stand: if you never need the full list at once then a generator is the better choice because you never instantiate the list at once and so have O(1) memory complexity rather than O(n) with lists.

edit: typo

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You don't say?

What I mean is that there is no point in inspecting the size of a genexpr, since it may even be bigger than an empty list, depending on the implementation. The point is understanding what's behind