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Remove Set Items

Python Tutorial

This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

Remove Set Items
Python's set class provides different methods to remove one or more items from a set object.
remove() Method
The remove() method removes the given item from the set collection, if it is present in it. However, if it is not present, it raises KeyError.
Syntax
set.remove(obj)
Parameters
obj − an immutable object
Example
lang1 = {"C", "C++", "Java", "Python"}
print ("Set before removing: ", lang1)
lang1.remove("Java")
print ("Set after removing: ", lang1)
lang1.remove("PHP")
It will produce the following output
Set before removing: {'C', 'C++', 'Python', 'Java'}
Set after removing: {'C', 'C++', 'Python'}
   lang1.remove("PHP")
KeyError: 'PHP'
discard() Method
The discard() method in set class is similar to remove() method. The only difference is, it doesn't raise error even if the object to be removed is not already present in the set collection.
Syntax
set.discard(obj)
Parameters
obj − An immutable object
Example
lang1 = {"C", "C++", "Java", "Python"}
print ("Set before discarding C++: ", lang1)
lang1.discard("C++")
print ("Set after discarding C++: ", lang1)
print ("Set before discarding PHP: ", lang1)
lang1.discard("PHP")
print ("Set after discarding PHP: ", lang1)
It will produce the following output 
Set before discarding C++: {'Java', 'C++', 'Python', 'C'}
Set after discarding C++: {'Java', 'Python', 'C'}
Set before discarding PHP: {'Java', 'Python', 'C'}
Set after discarding PHP: {'Java', 'Python', 'C'}
Practice with Online Editor
Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
Remember to save code(Ctrl + S Or Command + S) before run it.
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pop() Method
The pop() method in set class removes an arbitrary item from the set collection. The removed item is returned by the method. Popping from an empty set results in KeyError.
Syntax
obj = set.pop()
Return value
The pop() method returns the object removed from set.
Example
lang1 = {"C", "C++"}
print ("Set before popping: ", lang1)
obj = lang1.pop()
print ("object popped: ", obj)
print ("Set after popping: ", lang1)
obj = lang1.pop()
obj = lang1.pop()
It will produce the following output
Set before popping: {'C++', 'C'}
object popped: C++
Set after popping: {'C'}
Traceback (most recent call last):
   obj = lang1.pop()
         ^^^^^^^^^^^
KeyError: 'pop from an empty set'
At the time of call to pop() for third time, the set is empty, hence KeyError is raised.
clear() Method
The clear() method in set class removes all the items in a set object, leaving an empty set.
Syntax
set.clear()
Example
lang1 = {"C", "C++", "Java", "Python"}
print (lang1)
print ("After clear() method")
lang1.clear()
print (lang1)
It will produce the following output
{'Java', 'C++', 'Python', 'C'}
After clear() method
set()
Practice with Online Editor
Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
Remember to save code(Ctrl + S Or Command + S) before run it.
﻿
difference_update() Method
The difference_update() method in set class updates the set by removing items that are common between itself and another set given as argument.
Syntax
set.difference_update(obj)
Parameters
obj − a set object
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1 before running difference_update: ", s1)
s1.difference_update(s2)
print ("s1 after running difference_update: ", s1)
It will produce the following output
s1 before running difference_update: {1, 2, 3, 4, 5}
s1 after running difference_update: {1, 2, 3}
set()
difference() Method
The difference() method is similar to difference_update() method, except that it returns a new set object that contains the difference of the two existing sets.
Syntax
set.difference(obj)
Parameters
obj − a set object
Return value
The difference() method returns a new set with items remaining after removing those in obj.
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1: ", s1, "s2: ", s2)
s3 = s1.difference(s2)
print ("s3 = s1-s2: ", s3)
It will produce the following output
s1: {1, 2, 3, 4, 5} s2: {4, 5, 6, 7, 8}
s3 = s1-s2: {1, 2, 3}
Practice with Online Editor
Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
Remember to save code(Ctrl + S Or Command + S) before run it.
﻿
intersection_update() Method
As a result of intersection_update() method, the set object retains only those items which are common in itself and other set object given as argument.
Syntax
set.intersection_update(obj)
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Parameters
obj − a set object
Return value
The intersection_update() method removes uncommon items and keeps only those items which are common to itself and obj.
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1: ", s1, "s2: ", s2)
s1.intersection_update(s2)
print ("a1 after intersection: ", s1)
It will produce the following output
s1: {1, 2, 3, 4, 5} s2: {4, 5, 6, 7, 8}
s1 after intersection: {4, 5}
intersection() Method
The intersection() method in set class is similar to its intersection_update() method, except that it returns a new set object that consists of items common to existing sets.
Syntax
set.intersection(obj)
Parameters
obj − a set object
Return value
The intersection() method returns a set object, retaining only those items common in itself and obj.
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1: ", s1, "s2: ", s2)
s3 = s1.intersection(s2)
print ("s3 = s1 & s2: ", s3)
It will produce the following output
s1: {1, 2, 3, 4, 5} s2: {4, 5, 6, 7, 8}
s3 = s1 & s2: {4, 5}
Practice with Online Editor
Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
Remember to save code(Ctrl + S Or Command + S) before run it.
﻿
symmetric_difference_update() method
The symmetric difference between two sets is the collection of all the uncommon items, rejecting the common elements. The symmetric_difference_update() method updates a set with symmetric difference between itself and the set given as argument.
Syntax
set.symmetric_difference_update(obj)
Parameters
obj − a set object
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1: ", s1, "s2: ", s2)
s1.symmetric_difference_update(s2)
print ("s1 after running symmetric difference ", s1)
It will produce the following output
s1: {1, 2, 3, 4, 5} s2: {4, 5, 6, 7, 8}
s1 after running symmetric difference {1, 2, 3, 6, 7, 8}
symmetric_difference() Method
The symmetric_difference() method in set class is similar to symmetric_difference_update() method, except that it returns a new set object that holds all the items from two sets minus the common items.
Syntax
set.symmetric_difference(obj)
Parameters
obj − a set object
Return value
The symmetric_difference() method returns a new set that contains only those items not common between the two set objects.
Example
s1 = {1,2,3,4,5}
s2 = {4,5,6,7,8}
print ("s1: ", s1, "s2: ", s2)
s3 = s1.symmetric_difference(s2)
print ("s1 = s1^s2 ", s3)
It will produce the following output
s1: {1, 2, 3, 4, 5} s2: {4, 5, 6, 7, 8}
s1 = s1^s2 {1, 2, 3, 6, 7, 8}
Practice with Online Editor
Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
Remember to save code(Ctrl + S Or Command + S) before run it.
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Python Basics

Python Control Statement

Python Functions & Modules

Python Strings

Python Lists

Python Tuples

Python Sets

Python Dictionaries

Python Arrays

Python File Handling

Object Oriented Programming

Python Tutorial

Remove Set Items

remove() Method

Syntax

Parameters

Example

discard() Method

Syntax

Parameters

Example

Practice with Online Editor

pop() Method

Syntax

Return value

Example

clear() Method

Syntax

Example

Practice with Online Editor

difference_update() Method

Syntax

Parameters

Example

difference() Method

Syntax

Parameters

Return value

Example

Practice with Online Editor

intersection_update() Method

Syntax

Parameters

Return value

Example

intersection() Method

Syntax

Parameters

Return value

Example

Practice with Online Editor

symmetric_difference_update() method

Syntax

Parameters

Example

symmetric_difference() Method

Syntax

Parameters

Return value

Example

Practice with Online Editor

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