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Lecture-9 Sets in Python

Sets

It Data type which Act like Mathmatical sets. { }= Define sets.

Properties of Sets

  • Unorderd =

Unordered means that the items in a set do not have a defined order.

MyColor={'Sky','Red','Pink','Yellow','Green'}
print(MyColor)
  • Unindexed =

we cannot access the elements.

  • Unique values
MyColor={'Sky','Red','Pink','Yellow','Green','Sky','Pink'}
print(MyColor)

Adding values to Sets

add()=The add() method adds an element to the set.But position is not decide because set are unorderd.

Students={ "Aniket","Avishkar","priyanka"}
print(Students)
Students.add("Prachi")
print(Students)

Remove Elements to Sets

  • remove() = Hard Removal
Students={ "Aniket","Avishkar","priyanka","Vaibhavi","Vaishnavi"}
print(Students)
Students.remove("Vaibhavi")
print(Students)
  • discard() = Soft Removal
Students={ "Aniket","Avishkar","priyanka","Vaibhavi","Vaishnavi"}
print(Students)
Students.discard("Yash")
print(Students)

Union of Sets

The union() method returns a set that contains all items from the original set, and all items from the specified set.

StudentsList1={ "Aniket","Avishkar","priyanka","Vaibhavi"}
StudentsList2={"Vaishnavi","Divya","Pranali","Meghana","Vaibhavi"}
AllStudents=StudentsList1.union(StudentsList2)
print(AllStudents)

Intersection of Sets

The intersection() method returns a set that contains the similarity between two or more sets.

StudentsList1={ "Aniket","Avishkar","priyanka","Vaibhavi","Vaishnavi"}
StudentsList2={"Vaishnavi","Divya","Pranali","Meghana","Vaibhavi"}
AllStudents=StudentsList1.intersection(StudentsList2)
print(AllStudents)

Symmetric Differnce

StudentsList1={ "Aniket","Avishkar","priyanka","Vaibhavi","Vaishnavi"}
StudentsList2={"Vaishnavi","Divya","Pranali","Meghana","Vaibhavi"}
OnlyOneClassStudent=StudentsList1.symmetric_difference(StudentsList2)
print(OnlyOneClassStudent)

The symmetric_difference() method in Python for two elements StudentsList1 and StudentsList2 is used to return the set of elements contained in both StudentsList1 and StudentsList2 but not common in both of them.

🏠 HomeWork

1️⃣Write a program to use Add(),Remove() function to Sets.

👁 Show Answer 

#Add() Function
Colour={ "Red","Pink","Yellow"}
print(Colour)
Colour.add("Blue")
print(Colour)  

#Remove() Function
Colour={ "Red","Pink","Yellow"}
print(Colour)
Colour.remove("Pink")
print(Colour)

2️⃣Write a program to use 5 different operation on sets.

👁 Show Answer 

# union operation(1)
Girls={ "Gita","Radha","Sangita","Priya"}
Boys={"Omkar","Raj","Vaibhav","Sumit","Ganesh","Rohit"}
Class =Girls.union(Boys) 
print(Class)

# intersection operation(2)
Girls={ "Gita","Kiran","Sangita","Priya"}
Boys={"Omkar","Kiran","Vaibhav","Sumit","Ganesh","Rohit"}
Class =Girls.intersection(Boys) 
print(Class) 

# symmetric_difference operation(3)
Girls={ "Gita","Kiran","Sangita","Priya"}
Boys={"Omkar","Kiran","Vaibhav","Sumit","Ganesh","Rohit"}
Class =Girls.symmetric_difference(Boys) 
print(Class)

# Discard operation(4)
Boys={"Omkar","Kiran","Vaibhav","Sumit","Ganesh","Rohit"}
Boys.discard(3)
print(Boys)    

# add operation(5)
Boys={"Omkar","Kiran","Vaibhav","Sumit","Ganesh","Rohit"}
Boys.add("Rahul")
print(Boys)

🔗 Some Useful Links

📖 References