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Python practice problems help beginners to become experts in a python programming language with a small amount of practice effort.
Write a Python program to create a set of odd numbers from 1 to 20.
{1, 3, 5, 7, 9, 11, 13, 15, 17, 19}set(range(1, 21, 2)).print(set(range(1, 21, 2))){1, 3, 5, 7, 9, 11, 13, 15, 17, 19}New to this topic? Read the lesson, then come back.
Write a Python program to create a set of even numbers from 1 to 20.
{2, 4, 6, 8, 10, 12, 14, 16, 18, 20}print({n for n in range(1, 21) if n % 2 == 0}){2, 4, 6, 8, 10, 12, 14, 16, 18, 20}New to this topic? Read the lesson, then come back.
Write a Python program to convert a set into a dictionary.
{"a", "b", "c"}{'a': 0, 'b': 0, 'c': 0}
{'a': 97, 'b': 98, 'c': 99}dict.fromkeys(s, value) or a comprehension.s = {"a", "b", "c"}print(dict.fromkeys(sorted(s), 0))print({x: ord(x) for x in sorted(s)}){'a': 0, 'b': 0, 'c': 0}
{'a': 97, 'b': 98, 'c': 99}New to this topic? Read the lesson, then come back.
Write a Python program to find the position of an element in a set.
{30, 10, 20}, element 20[10, 20, 30] 1
index().s = {30, 10, 20}ordered = sorted(s)print(ordered, ordered.index(20))[10, 20, 30] 1
A set is unordered, so a position only means something after you convert it to a sorted list.
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Write a Python program to find which elements of a set appear in a string.
{"py", "java", "test"}, "python testing"['py', 'test']
[w for w in s if w in text].words = {"py", "java", "test"}text = "python testing"print(sorted(w for w in words if w in text))['py', 'test']
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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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