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From the list [3, 1, 3, 2, 1], make a new list that has each value only once, in the order of the…

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Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

From the list $[3, 1, 3, 2, 1]$ , make a new list that has each value only once, in the order of the first appearance: $[3, 1, 2]$ .

Need a reminder? The key ideaShow

Use not in to test if a value is missing from a list.

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.

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