Collection operations

list1=[1,2,3,4,5,6,4,5,6]
list2=[2,3,7,8,9]

list1=set(list1) #Remove
list2=set(list2) #Remove 

print(list1,list2)

print(list1.intersection(list2))
print(list1 & list2) #Intersection

print(list1.union(list2))
print(list1 | list2) #Union

print(list1.difference(list2))
print(list1-list2)   #差集
print(list2.difference(list1))
print(list2-list1)   #差集

print(list1.symmetric_difference(list2))
print(list1^list2) #symmetric difference set

list3=set([1,2,3,4,5])
list4=set([1,2,3])
print(list4.issubset(list3))     #子集    True
print(list4.issubset(list2))     #子集    False
print(list3.issuperset(list4))   #父集    True
print(list2.issuperset(list4))   #父集    False

x in s
s not in s
s.copy    浅copy