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itertools.tee: "This itertool may require significant auxiliary storage (depending on how much temporary data needs to be stored). In general, if one iterator uses most or all of the data before another iterator starts, it is faster to uselist()instead oftee()."iterin the first place, instead of usingfruitdirectly? Theforloop is implicitly callingiteronits, even if it is already an iterator.iterbut from the structure of the code, that is what is happening. I am to just consume the iterator.del it1, it2? It's pointless. Anyway,teeis good of you use part of the results then need to start consuming again, if you are going to consume the whole thing once then need to do it again, you might as well just uselist