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])
B = set([3,4])
C = set([2])
n = A.difference(B,C)
print(n) #输出：{5}
#返回A集合里面，在B和C集合中没有的元素，并生成新的集合
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,如果元素不存在不报错)
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,元素不存在会报错)
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}