Python Programming : A Modern Approach

2.18 Python Programming: A Modern Approach

python sets.py

[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 1, 3, 5, 7, 9,

11, 13, 15, 17, 19, 21, 23, 2, 3, 5, 7, 11, 13, 17, 19, 23]

<class 'list'>

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,

18, 19, 20, 21, 22, 23, 24}

<class 'set'>

2.5.1 Modifying a Set

There are two different ways to add values to an existing set, which is the add() method

and the update() method.

numbers = {1, 2}

numbers.add(4)

print(numbers)

print(len(numbers))

numbers.add(1)

print(numbers)

print(len(numbers))

numbers.add(5)

print(numbers)

print(len(numbers))

magic_numbers = {8, 20, 28, 50, 82}

numbers.update(magic_numbers) ...