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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…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
From the list , make a new list that has each value only once, in the order of the first appearance: .
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.
Plan. Start with an empty list, unique. Go through the numbers. If a number is not in unique yet, append it.
- is not in
[]:[3]. - is not in
[3]:[3, 1]. - is in the list: skip.
- is not in the list:
[3, 1, 2]. - is in the list: skip.
Answer: [3, 1, 2].
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