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Intermediate · 11 min

Sets and unique values

Remove duplicates and compare collections with set operations.

Keep unique items

A set stores each value once. Converting a list to a set removes duplicates; sorting gives a predictable display order.

tags = ["python", "web", "python"]
unique = sorted(set(tags))
print(unique)

Output

['python', 'web']

Find shared values

The & operator returns the intersection: values present in both sets.

team_a = {"Ada", "Mina"}
team_b = {"Mina", "Leo"}
print(sorted(team_a & team_b))

Output

['Mina']

Sets and unique values

  1. Read both sets and unique values examples before answering.
  2. Run the task, compare its exact output, and revise the code if needed.

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Find new attendees

Create newcomers containing names in today but not yesterday. Display the names in sorted order.

Practice