Tuples represent fixed sequences
Tuples are immutable sequences and are useful when a group of values should not be changed through normal sequence operations. They are also commonly used for returning multiple values from a function.
Sets represent uniqueness
A set stores unique hashable values. It is excellent for membership checks, duplicate removal and mathematical operations such as union, intersection and difference.
Choose based on the operation
Do not use a set when application order is the primary meaning of the data. Do not use a tuple merely because it looks shorter than a list; choose it when immutability or tuple semantics are useful.
Practice: compare two lists of course IDs and find common courses, courses unique to each list and the combined unique course set.
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