MediumPython ProgrammingHigh School (11–12)High School (9–10)UndergraduateGeneralPython Going Further › Comprehensions, Iterators and GeneratorsConceptual
Used up
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
What does this program show? Say it before you run it.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
Plan. An iterator is used up after one pass. A list gives a fresh iterator each time.
sum(it): 1 + 2 + 3 = 6.sum(it)again: the iterator is used up, so there is nothing to add: 0.sum(numbers): 6. 4.sum(numbers)again: still 6, because the list is not used up.max(squares): the squares are 1, 4, 9, so 9.max(squares, default="none"): the generator is used up, so there is nothing to compare. Without thedefault,maxwould raise aValueError. With it, it givesnone.
Answer: 6, 0, 6, 6, 9, none.
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