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Python Set Programs
Write a Python program to find the intersection of two sets.
{1, 2, 3, 4}, {3, 4, 5}{3, 4} {3, 4}& or intersection().a, b = {1, 2, 3, 4}, {3, 4, 5}print(a & b, a.intersection(b)){3, 4} {3, 4}New to this topic? Read the lesson, then come back.
Write a Python program to find the union of two sets.
{1, 2, 3}, {3, 4, 5}{1, 2, 3, 4, 5} {1, 2, 3, 4, 5}| or union().a, b = {1, 2, 3}, {3, 4, 5}print(a | b, a.union(b)){1, 2, 3, 4, 5} {1, 2, 3, 4, 5}New to this topic? Read the lesson, then come back.
Write a Python program to check whether an element is in a set.
{2, 4, 6}, check 4 and 5True False
in is very fast on sets.s = {2, 4, 6}print(4 in s, 5 in s)True False
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Write a Python program to find the number of items in a set.
{"a", "b", "c", "a"}3
len() counts unique items.print(len({"a", "b", "c", "a"}))3
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Write a Python program to remove an element from a set.
{10, 20, 30}{10, 30}remove() raises KeyError if missing; discard() does not.s = {10, 20, 30}s.remove(20)s.discard(99)print(s){10, 30}New to this topic? Read the lesson, then come back.
Write a Python program to add elements to a set.
{1, 2}{1, 2, 3}add() for one item; adding an existing item does nothing.s = {1, 2}s.add(3)s.add(2)print(s){1, 2, 3}New to this topic? Read the lesson, then come back.
Write a Python program to create a set and show that duplicates are removed.
{8, 3, 5} 3
set 0set() for an empty set.numbers = {5, 3, 8, 3, 5}empty = set()print(numbers, len(numbers))print(type(empty).__name__, len(empty)){8, 3, 5} 3
set 0The repeated 3 and 5 are stored once.
{} would create a dictionary, so an empty set needs set().
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