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Python Set Programs
Write a Python program to check whether a set is a superset of another.
{1, 2, 3, 4}, {2, 3}True False
>= or issuperset().print({1, 2, 3, 4} >= {2, 3}, {1, 2} >= {2, 3})True False
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Write a Python program to update a set to the symmetric difference with another set.
{1, 2, 3}, {3, 4}{1, 2, 4}^=.a = {1, 2, 3}a ^= {3, 4}print(a){1, 2, 4}New to this topic? Read the lesson, then come back.
Write a Python program to find the union of several sets.
{1, 2}, {2, 3}, {3, 4}{1, 2, 3, 4}set().union(*sets).sets = [{1, 2}, {2, 3}, {3, 4}]print(set().union(*sets)){1, 2, 3, 4}New to this topic? Read the lesson, then come back.
Write a Python program to keep only the items shared with another set.
{1, 2, 3, 4}, {2, 4, 6}{2, 4}intersection_update() or &=.a = {1, 2, 3, 4}a &= {2, 4, 6}print(a){2, 4}New to this topic? Read the lesson, then come back.
Write a Python program to find the difference between two sets with the method and the operator.
{"a", "b", "c"}, {"b"}['a', 'c'] ['a', 'c']
difference() accepts any iterable; - needs sets.a = {"a", "b", "c"}print(sorted(a.difference(["b"])), sorted(a - {"b"}))['a', 'c'] ['a', 'c']
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Write a Python program to remove and return an arbitrary element with pop().
{10, 20, 30}True 2
pop() removes some element; you cannot choose which.s = {10, 20, 30}item = s.pop()print(item in {10, 20, 30}, len(s))True 2
Which element comes out is an implementation detail, so the program checks the result instead of printing a value that could differ.
For a truly random choice, use random.choice(list(s)).
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Write a Python program to remove all elements from a set.
{1, 2, 3}set()
clear().s = {1, 2, 3}s.clear()print(s)set()
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Write a Python program to check whether a set is a subset of any set in a list.
{1, 2}; [{3, 4}, {1, 2, 5}, {6}]True
any(target <= s for s in sets).target = {1, 2}sets = [{3, 4}, {1, 2, 5}, {6}]print(any(target <= s for s in sets))True
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Write a Python program to check whether all elements of a set are prime, and list the primes.
{2, 3, 5, 9}False [2, 3, 5]
def is_prime(n): return n > 1 and all(n % d for d in range(2, int(n ** 0.5) + 1)) s = {2, 3, 5, 9}print(all(is_prime(x) for x in s), sorted(x for x in s if is_prime(x)))False [2, 3, 5]
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Write a Python program to check whether all elements of a set are odd.
{1, 3, 5}, {1, 4}{1, 3, 5} True
{1, 4} Falseall(x % 2 == 1 for x in s).for s in [{1, 3, 5}, {1, 4}]: print(s, all(x % 2 == 1 for x in s)){1, 3, 5} True
{1, 4} FalseNew to this topic? Read the lesson, then come back.