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Choose a list, a tuple, a set or a dictionary for each, and give a reason in one sentence…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Choose a list, a tuple, a set or a dictionary for each, and give a reason in one sentence.
- The (red, green, blue) numbers of a colour.
- The different countries that a traveller visited.
- The population of each country.
- The scores of a game, in the order in which they were made.
- The words that are allowed in a spelling game, checked many times.
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, go through the solution one step at a time, and check each step against your own.
Plan. Use the three questions: position or name? Fixed or changing? Order and repeats?
- A tuple. Three values that belong together and do not change.
- A set. Each country counts once, and the question is "did the traveller go there?".
- A dictionary. Found by the name of the country.
- A list. The order matters, repeats are allowed (two equal scores), and new scores are added.
- A set. The program asks "is this word allowed?" many times, and a set answers fast.
Check. For each answer, ask: does another container fit better? The scores could be a tuple if the game were over and could not change, but a list is more natural while the game goes on.
Answer: tuple, set, dictionary, list, set.
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