MediumPython ProgrammingHigh School (11–12)High School (9–10)UndergraduateGeneralPython Going Further › Comprehensions, Iterators and GeneratorsConceptualPython-Coded
Follow the generator
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
Have you tried it?
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. Nothing in gen runs until the first next. Each next runs to the next yield.
g = gen(): nothing runs.print("start"): showsstart.print(next(g)): runsprint("a"), and gives 1. Showsa, then1.print(next(g)): runsprint("b"), and gives 2. Showsb, then2.for x in g:: continues after the secondyield: runsprint("c"), and the body ends. No more values, so the loop body never runs. Showsc.print("end").
Answer: start, a, 1, b, 2, c, end, each on its own line. The word never is not shown.
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