[Python] Remove duplicate elements from list

Lists = [A, M, m, MB] Print list (set (lists))

Set () is a built-in data type "collection type" that is unordered and has a unique value. So the result of the set () is to go to the set and directly away from the duplicated elements, and then list () to return the collection back to the type. However, set () will break the order, and if you want to keep the sort, list (set (lists)) can be changed to sorted (set (lists), Key=lists.index)

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We need to sort the list, Python provides two methods
To sort the given list L.
Method 1. Sort with the member function of the list
Method 2. Sort with the built-in function sorted (starting from 2.4)

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