Python Set difference() Last Updated : 26 Feb, 2025 Comments Improve Suggest changes Like Article Like Report In Python, the difference() method is used to find elements that exist in one set but not in another. It returns a new set containing elements from the first set that are not present in the second set. This operation is similar to the subtraction of sets (A - B), where only unique elements from the first set remain. For example: Python A = {10, 20, 30, 40, 80} B = {100, 30, 80, 40, 60} print(A.difference(B)) # Elements in A but not in B print(B.difference(A)) # Elements in B but not in A Output{10, 20} {100, 60} Let’s look at the Venn diagram of the following difference set function.Syntax:set_A.difference(set_B) for (A - B)set_B.difference(set_A) for (B - A)Using difference() with Multiple Setsdifference() method can be used with multiple sets to find elements unique to the first set compared to all others. Python A = {1, 2, 3, 4, 5} B = {3, 4, 5, 6, 7} C = {5, 6, 7, 8, 9} res = A.difference(B, C) # Elements in A that are not in B or C print(res) Output{1, 2} Explanation: elements {3, 4, 5} are common in A and at least one of B or C, so they are removed from A. The remaining elements {1, 2} are unique to A thereby forming the result.Using difference() with an Empty SetIf we take the difference of a set with an empty set then the original set remains unchanged. Python A = {10, 20, 30, 40} B = set() print(A.difference(B)) Output{40, 10, 20, 30} Explanation: Since B is empty there are no elements to remove from A hence the result remains the same as A.When Sets Are EqualIf two sets are equal or one is a subset of the other, the difference results in an empty set. Python A = {10, 20, 30, 40, 80} B = {10, 20, 30, 40, 80, 100} print(A.difference(B)) # Returns an empty set as A is fully contained in B Outputset() Explanation: Since all elements of A are present in B, there are no unique elements left in A after performing the difference operation hence resulting in an empty set. Comment More infoAdvertise with us Next Article issuperset() in Python C chinmoy lenka Follow Improve Article Tags : Python python-set Practice Tags : pythonpython-set Similar Reads Python Set Methods A Set in Python is a collection of unique elements which are unordered and mutable. Python provides various functions to work with Set. In this article, we will see a list of all the functions provided by Python to deal with Sets. Adding and Removing elementsWe can add and remove elements form the s 2 min read Set add() Method in Python The set.add() method in Python adds a new element to a set while ensuring uniqueness. It prevents duplicates automatically and only allows immutable types like numbers, strings, or tuples. If the element already exists, the set remains unchanged, while mutable types like lists or dictionaries cannot 4 min read Python Set clear() Method Python Set clear() method removes all elements from the set. Python Set clear() Method Syntax: Syntax: set.clear() parameters: The clear() method doesn't take any parameters.  Return: None Time complexity : The time complexity of set.clear() function on a set with n element is O(n) . Example 1: Pyth 2 min read set copy() in python The copy() method returns a shallow copy of the set in python. If we use "=" to copy a set to another set, when we modify in the copied set, the changes are also reflected in the original set. So we have to create a shallow copy of the set such that when we modify something in the copied set, change 2 min read Python Set discard() Function Python discard() is a built-in method to remove elements from the set. The discard() method takes exactly one argument. This method does not return any value. Example: In this example, we are removing the integer 3 from the set with discard() in Python. Python3 my_set = {1, 2, 3, 4, 5} my_set.discar 3 min read Python Set | difference_update() The difference_update() method helps in an in-place way of differentiating the set. The previously discussed set difference() helps to find out the difference between two sets and returns a new set with the difference value, but the difference_update() updates the existing caller set.If A and B are 1 min read Python Set difference() In Python, the difference() method is used to find elements that exist in one set but not in another. It returns a new set containing elements from the first set that are not present in the second set. This operation is similar to the subtraction of sets (A - B), where only unique elements from the 2 min read issuperset() in Python Python Set issuperset() method returns True if all elements of a set B are in set A. Then Set A is the superset of set B. Python issuperset() Method Syntax: Syntax: A.issuperset(B) Parameter: Any other Set to compare with Return: boolean value  Python issuperset() exampleExample 1: Working of issubs 1 min read Python Set issubset() Method Python set issubset() method returns True if all elements of a set A are present in another set B which is passed as an argument, and returns False if all elements are not present in Python. Python Set issubset() Method SyntaxSyntax: set_obj.issubset(other_set) Parameter: other_set: any other set to 2 min read Python Set isdisjoint() Method Python set isdisjoint() function check whether the two sets are disjoint or not, if it is disjoint then it returns True otherwise it will return False. Two sets are said to be disjoint when their intersection is null. Python set isdisjoint() Method Syntax: Syntax: set1.isdisjoint(set2) Parameters: 2 min read Like