要素の追加削除
discardは該当要素がなくても例外発生しない
>>> a = {1,2,3,4,5}
>>> a.add(6)
>>> a
{1, 2, 3, 4, 5, 6}
>>> a.remove(3)
>>> a
{1, 2, 4, 5, 6}
>>> a.remove(7)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 7
>>> a
{1, 2, 4, 5, 6}
>>> a.discard(7)
>>> a
{1, 2, 4, 5, 6}
>>> a.discard(1)
>>> a
{2, 4, 5, 6}
>>>
合併
>>> a = {1,2}
>>> b = {1,3}
>>> c = {1,4}
>>> a | b | c
{1, 2, 3, 4}
>>>
共通要素の抽出
>>> a
{1, 2}
>>> b
{1, 3}
>>> c
{1, 4}
>>> a & b & c
{1}
>>>
差の抽出
>>> a
{1, 2}
>>> b
{1, 3}
>>> c
{1, 4}
>>> a - b - c
{2}
>>>
独自要素の抽出
>>> a
{1, 2}
>>> b
{1, 3}
>>> c
{1, 4}
>>> a ^ b
{2, 3}
>>> a ^ b ^ c
{1, 2, 3, 4}
>>> a ^ (b | c)
{2, 3, 4}
>>>
要素の全てを含んでいるか確認
>>> a
{1, 2}
>>> b
{1, 2, 3}
>>> c
{2, 4}
>>> a <= b
True
>>> a <= c
False
>>> b >= a
True
>>> b >= c
False
>>>
