add（增加元素）
name = set([‘tom’,’lucy’,’ben’])
name.add(‘juny’)print(name)#输出：{‘lucy’, ‘juny’, ‘ben’, ‘tom’}
clear（清空所有元素）
name = set([‘tom’,’lucy’,’ben’])
name.clear()print(name)#输出：set()
copy(拷贝set集合)
name = set([‘tom’,’lucy’,’ben’])
new_name = name.copy()print(new_name)#输出：{‘tom’, ‘lucy’, ‘ben’}
difference(返回两个或多个集合中不同的元素，并生成新的集合)
a = set([2,3,4,5= set([3,4= set([2=
difference_update（删除a集合里面，在b集合中存在的元素。）
a = set([2,3,4,5])
b = set([4,5])
a.difference_update(b)print(a)#输出：{2, 3}
discard(移除元素)
n = set([2,3,4])
n.discard(3)print(n)#输出：{2, 4}
intersection(取交集，并生成新的集合)
n1 = set([2,3,4,5])
n2 = set([4,5,6,7])
n = n1.intersection(n2)print(n)#输出：{4, 5}
intersection_update(取交集，修改原来的集合)
n1 = set([2,3,4,5])
n2 = set([4,5,6,7])
n1.intersection_update(n2)print(n1)#输出：{4, 5}
isdisjoint(判断交集，是返回false，否返回true)
n1 = set([2,3,4,5])
n2 = set([4,5,6,7])print(n1.isdisjoint(n2))#输出：false
issubset(判断子集)
a = set([2,3])
b = set([2,3,4,5])print(a.issubset(b))#输出：true#a是b的子集
issuperset(判断父集)
a = set([2,3])
b = set([2,3,4,5])print(b.issuperset(a))# 输出：true#b是a的父集
pop(随机移除一个元素)
n = set([2,3,4,5])
n1 = n.pop()print(n,n1)# 输出：{3, 4, 5} 2
remove(移除指定元素)
n = set([2,3,4,5])
n.remove(2)print(n)# 输出：{3, 4, 5}
symmetric_difference(取交集，并生成新的集合)
a = set([2,3,4,5])
b = set([4,5,6,7])print(a.symmetric_difference(b))# 输出：{2, 3, 6, 7}
symmetric_difference_update(取交集，改变原来的集合)
a = set([2,3,4,5])
b = set([4,5,6,7])
a.symmetric_difference_update(b)print(a)# 输出：{2, 3, 6, 7}
union（取并集，并生成新的集合）
a = set([2,3,4,5])
b = set([4,5,6,7])print(a.union(b))# 输出：{2, 3, 4, 5, 6, 7}
update(取并集，改变原来的集合)
a = set([2,3,4,5])
b = set([4,5,6,7])
a.update(b)print(a)# 输出：{2, 3, 4, 5, 6, 7}
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