Summary - Set

Add elements to a set and print it in a mini task.

Summary - Set

In this group you learned what a set is, add and search, intersection and union. A set manages unique elements in O(1).

A set is a powerful tool for data analysis with operations like intersection and union. Duplicates are automatically eliminated.

Exercise Union

Write set_union(a, b). Return sorted union of a and b. Print [1, 2, 3, 4] with print(set_union({1,2}, {2,3,4})).

Show example solution

def set_union(a, b):
    # Union
    result = set()
    for x in a:
        result.add(x)
    for x in b:
        result.add(x)
    return sorted(result)
print(set_union({1, 2}, {2, 3, 4}))

Test yourself

Summary - Set: match the terms

set

Unique
add

Add
intersection

A & B
union

A | B

Set

A set stores ____ elements.

Show answer

A set stores unique elements.

What happens if the same element is added twice to a set?
- Added twice
- Deleted
- Stays once
- Raises error
Show answer

Stays once — It stays once, not added again.

Next lesson: Challenge 1

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