Usage of the Python set collection

Set Set: is a set of unordered, non-repeatable collections

Creation of 1.set

se={"ww3", 23432,"name"}# Create an empty collection Se1=set ()

2. Convert to a collection

li=[23,56,23,44]se=set (li)print(se)# output: {56, 44, 23} 

Common methods of 3.set

Add (self, *args, **kwargs): adds an element to the collection, and if the collection already has this element, it is not added for long

# element not added in collection case se={23,54,11,788}se.addprint(se)# output: {one, 788, wu, wu, si} # a situation in the collection where the element to be added is already in se={23,54,11,788}se.add ()print(se) # output: {one, 788, si, +}Clear (self, *args, **kwargs)

Clear (self, *args, **kwargs): Deletes all elements in the collection

se={23,54,11,788}se.clear ()print(se)# output: set ()

Difference (self, *args, **kwargs): compare two sets, find the element that the other does not have, and return a new collection

se={23,54,11,788}re={23,22,11,77}ge=se.difference (re)# Find all elements in se except for the same element as re  print(ge)# output: {788, si}

Difference_update (self, *args, **kwargs): compare a collection, find the element that the other does not have, and update yourself

se={23,54,11,788}re={23,54,11,77}se.difference_update (re)# Find all elements in se except for the same element as re  Print(se)
#输出: {788}

Discard (self, *args, **kwargs): removes an element from the collection, and nothing happens if the removed element is not in the collection

se={23,54,11,788}se.discard (all)print(se)# output: {11, 788, 54} 

Remove (self, *args, **kwargs): removes an element from the collection that must be a member of the collection if not, it will be an error .

Intersection (self, *args, **kwargs): returns the intersection of 2 sets as a new collection

se={23,54,11,788}re={23,44,55,66}ge=se.intersection (re)print(ge) # output: {%}

Intersection_update (self, *args, **kwargs): Find the same elements of two sets and update yourself

se={23,54,11,788}re={23,44,55,66}se.intersection_update (re)print(se)#  output: {%}

Pop (self, *args, **kwargs): arbitrarily removes an element from the collection and returns the removed element, or an error if the collection is empty

se={23,54,11,788}re=se.pop ()print(se)print(re) # output: {788, si, +}      

Update (self, *args, **kwargs): updates Another collection into its own collection

se={23,54,11,788}ge={23,324,567}se.update (ge)print(se)# output: { 788, 324 , wu, si, 567, one}

　

Usage of the Python set collection