jihe

集合的增删改查

增

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

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

a.add(7)
a

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

a.update([8,9])

a

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

删

a.pop()

1

a.remove(7)
a

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

a.discard(4)
a

{2, 3, 5, 6, 8, 9}

改

a = set('123')
a

{'1', '2', '3'}

b = set('456')
b

{'4', '5', '6'}

a.update(b)
a

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

a.difference_update(b)
a

{'1', '2', '3'}

查

a.isdisjoint(b)

True

a.issubset(b)

False

a.issuperset(b)

False