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One function shows its answer with print…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
One function shows its answer with print. Another returns it. What do the two programs show? Why can only the second answer be used in a sum?
Need a reminder? The key ideaShow
print shows. return gives back. A function with no return gives back None.
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.
show_double(4)shows8, and gives back nothing. Soanswer1isNone, andprint(answer1)showsNone.return_double(4)shows nothing by itself. It gives back8, which is stored inanswer2.print(answer2)shows8.return_double(4) + 1is8 + 1, which shows9.
Answer: the program shows 8, None, 8 and 9.
Only a returned value can be used in a sum. A value that was only shown on the screen is gone.
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