Elaborate on the collection in Python

• Function of the collection:

1) go to the weight: a list into a set, it automatically go heavy;

2) Relationship test: The intersection, difference set and set of two sets of data are obtained;

1 #go to heavy instance2list=[1,34,2,45,34,67,89,67]3list=set (list)4 Print(list)5 Print(Type (list))6 7 #result8 #changes to the data have been heavy, and the list has become set; Note: collections are unordered.9{1, 34, 67, 2, 45, 89}Ten<class 'Set'>

• Collection of additions and deletions to change:

1List=set ([1,34,2,45,34])2 #add: Only one data can be added3List.add (10)4 Print(list)5 #Update: Multiple data can be added6List.update ([11,77,88])7 Print(list)8 #Delete Remove,remove error when deleting non-existent data9List.remove (45)Ten Print(list) One #deleting Pop:pop is the random deletion of data in set A Print(List.pop ()) - #Delete Discard,discard does not error when deleting non-existent data; -List.discard (40) the Print(list) -  - #result -{10, 1, 34, 2, 45} +{1, 34, 2, 10, 11, 45, 77, 88} -{1, 34, 2, 10, 11, 77, 88} +1 A{34, 2, 10, 11, 77, 88}

1list=[2,44,56]2list1=[34,2,44,56,78,89,90]3list=set (list)4list1=Set (List1)5 6 #subset7A=List.issubset (List1)8 Print(a)9 #Parent SetTenb=list1.issuperset (list) One Print(b) A  -  - #result the True -True

1list=[1,34,2,45,34,67,89,67]2list1=[34,2,44,56,78,89,90]3 4list=set (list)5list1=Set (List1)6 7 #intersection (&)8A=list.intersection (List1)9 Print(a)Ten #The Set (|) Oneb=list.union (List1) A Print(b) - #difference Set (-) -C=list.difference (List1) the Print(c) - #对称difference = set-intersection (^) -D=list.symmetric_difference (List1) - Print(d) +  - #result +{89, 34, 2} A{1, 34, 67, 2, 44, 45, 78, 56, 89, 90} at{1, 67, 45} -{1, 67, 56, 90, 44, 45, 78}

  1  list=[1,34,2,45,34]   2  list1=[3,44,56,78,89,90"   3   4  list= Set (list)   5  list1=set (list1)   6  #   If there are no intersections between the two sets of data, Returns True, otherwise false   7  f=list.isdisjoint ( List1)   8  print   (f)   9  10  #  result  11  True 

Elaborating on collections in Python