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Python Set Programs
Write a Python program to find the items shared by several sets.
{1, 2, 3}, {2, 3, 4}, {3, 4, 5}{3}set.intersection(*sets).sets = [{1, 2, 3}, {2, 3, 4}, {3, 4, 5}]print(set.intersection(*sets)){3}New to this topic? Read the lesson, then come back.
Write a Python program to remove from one set the items of several others.
{1, 2, 3, 4, 5}, {2}, {4, 5}{1, 3}difference() accepts several sets.print({1, 2, 3, 4, 5}.difference({2}, {4, 5})){1, 3}New to this topic? Read the lesson, then come back.
Write a Python program to create a frozenset and show that it cannot be changed.
frozenset({1, 2, 3})
Error: 'frozenset' object has no attribute 'add'frozenset(iterable); it has no add method.fs = frozenset([3, 1, 2])print(fs)try: fs.add(4)except AttributeError as e: print("Error:", e)frozenset({1, 2, 3})
Error: 'frozenset' object has no attribute 'add'New to this topic? Read the lesson, then come back.
Write a Python program to check whether a value is a frozenset.
frozenset({1, 2}), {1, 2}frozenset True set False
isinstance(x, frozenset).for x in [frozenset({1, 2}), {1, 2}]: print(type(x).__name__, isinstance(x, frozenset))frozenset True set False
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Write a Python program to check whether two sets are equal.
{1, 2, 3}, {3, 2, 1}True False
== compares contents; order does not matter.print({1, 2, 3} == {3, 2, 1}, {1, 2} == {1, 2, 3})True False
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Write a Python program to check whether a set is empty.
set(), {1}set() empty
{1} not emptyfor s in [set(), {1}]: print(s, "empty" if not s else "not empty")set() empty
{1} not emptyNew to this topic? Read the lesson, then come back.
Write a Python program to remove several elements at once.
{1, 2, 3, 4, 5}, remove [2, 4]{1, 3, 5}difference_update() or -=.s = {1, 2, 3, 4, 5}s -= {2, 4}print(s){1, 3, 5}New to this topic? Read the lesson, then come back.
Write a Python program to add several elements at once.
{1, 2}, add [3, 4, 2]{1, 2, 3, 4}update() takes any iterable.s = {1, 2}s.update([3, 4, 2])print(s){1, 2, 3, 4}New to this topic? Read the lesson, then come back.
Write a Python program to remove a specific element, reporting whether it was there.
{5, 10, 15}, remove 10 and 99removed 10
99 not in set
{5, 15}in, then remove().s = {5, 10, 15}for x in [10, 99]: if x in s: s.remove(x) print("removed", x) else: print(x, "not in set")print(s)removed 10
99 not in set
{5, 15}New to this topic? Read the lesson, then come back.
Write a Python program to find the elements common to two sets of words.
{"python", "java", "sql"}, {"sql", "python", "go"}['python', 'sql']
&, then sorted for display.a = {"python", "java", "sql"}b = {"sql", "python", "go"}print(sorted(a & b))['python', 'sql']
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