Python 집합 자료형

집합 자료형

>>> s1 = set([1, 2, 3])

>>> s1

{1, 2, 3}

>>> s2 = set("Hello")

>>> s2

{'e', 'l', 'o', 'H'}

집합 자료형의 특징

중복을 허용하지 않는다

순서가 없다(Unordered) - indexing 불가

>>>s1 =set([1, 2, 3])

>>> l1 = list(s1)

>>> l1

[1, 2, 3]

>>> l1[0]

1

>>> t1 = tuple(s1)

>>> t1

(1, 2, 3)

>>> t1[0]

1

집합 자료형 활용하는 방법

>>> s1 = set([1, 2, 3, 4, 5, 6])

>>> s2 = set([4, 5, 6, 7, 8, 9])

>>> s1 & s2

{4, 5, 6}

>>> s1.intersection(s2)

{4, 5, 6}

>>> s1 | s2

{1, 2, 3, 4, 5, 6, 7, 8, 9}

>>>s1.union(s2)

{1, 2, 3, 4, 5, 6, 7, 8, 9}

>>> s1 - s2

{1, 2, 3}

>>> s2 - s1

{8, 9, 7}

>>> s1.difference(s2)

{1, 2, 3}

>>> s2.difference(s1)

{8, 9, 7}

집합 자료형 API

>>> s1 = set([1, 2, 3])

>>> s1.add(4)

>>> s1

{1, 2, 3, 4}

>>> s1 = set([1, 2, 3])

>>> s1.update([4, 5, 6])

>>> s1

{1, 2, 3, 4, 5, 6}

>>> s1 = set([1, 2, 3])

>>> s1.remove(2)

>>> s1

{1, 3}