Sets

A set an unordered collection of items. Every element is unique and which are immutable. Set elements are enclosed in curly braces {}.

Create a set

#creating set with elements
set1 = {1,2,3,4}
#creating empty set
set2 = set()

Set Operations: Let us consider the following sets:

setA = {1,2,3,4,5}
setB = {4,5,6,7,8}

1. Union: It is a set of all elements from both sets. Union is performed using | operator.

   setA = {1,2,3,4,5}
   setB = {4,5,6,7,8}
   print(setA|setB)
   

   {1, 2, 3, 4, 5, 6, 7, 8}
   

2. Intersection: It is a set of elements that are common in both sets. Intersection is performed using & operator.

   setA = {1,2,3,4,5}
   setB = {4,5,6,7,8}
   print(setA&setB)
   

   {4,5}
   

3. Difference: It is a set of elements that are only in setA but not in setB. Difference is performed using - operator.

   setA = {1,2,3,4,5}
   setB = {4,5,6,7,8}
   print(setA-setB)
   print(setB-setA)
   

   {1,2,3}
   {6,7,8}
   

4. Symmetric Difference: It is a set of elements in both setA and setB except those are common in both. Symmetric difference is performed using ^ operator.

   setA = {1,2,3,4,5}
   setB = {4,5,6,7,8}
   print(setA^setB)
   

   {1, 2, 3, 6, 7, 8}
   

Set Methods:

1. add()
2. clear()
3. copy()
4. difference()
5. difference_update()
6. discard()
7. intersection()
8. intersection_update()
9. isdisjoint()
10. issubset()
11. issuperset()
12. pop()
13. remove()
14. symmetric_difference()
15. symmetric_difference_update()
16. union()
17. update()