# Python Set symmetric_difference() Method Example

Python set symmetric_difference() is an inbuilt function that returns a new set which is the symmetric difference of two sets. If **A = {1,2,3,4,5} and B = {4,5,6,7,8,9} **are two sets then the symmetric difference of these two sets is those elements that are present either in Set A or Set B but not in both the sets.

Here, we can see that 4 and 5 are present in both the sets, so values except 4 and 5 are symmetric difference of these sets, shown in the set C.

**Python Set symmetric_difference()**

The symmetric difference of two sets set1 and set2 is the set of elements that are in either of the sets set1 or set2 but not in both.

**Syntax**

A.symmetric_difference(B)

Here A is one set and B is another set.

**Return Value**

This method returns a new set which is the difference between these sets. It returns a set which is the symmetric difference between the two sets.

See the following code example.

# app.py # Declaring two sets # Even nums between 2 and 10 set1 = {2, 4, 6, 8, 10} # Multiple of 3 between 1 to 10 set2 = {3, 6, 9} # priting both the sets print("Set1 is: ", set1) print("Set2 is : ", set2) # Now we will find symmetric difference of these two sets print("Symmetric difference of set1 and set2 is: ", set1.symmetric_difference(set2))

**Output**

Set1 is: {2, 4, 6, 8, 10} Set2 is : {9, 3, 6} Symmetric difference of set1 and set2 is: {2, 3, 4, 8, 9, 10}

Here, we can see that Set1 contains elements of even numbers from 1 to 10 and Set 2 contains elements of multiple of 3 from 1 to 10.

So, we can see that 6 is the only value which is present in both the sets. So according to the definition, except 6 all the values will be the symmetric difference between these two sets.

Let’s see another working example.

# app.py list1 = [11, 21, 31] list2 = [21, 31, 41] list3 = [31, 41, 51] # Convert list to sets set1 = set(list1) set2 = set(list2) # Prints the symmetric difference when # set is passed as a parameter print(set1.symmetric_difference(set2)) # Prints the symmetric difference when list is # passed as a parameter by converting it to a set print(set2.symmetric_difference(list3))

**Output**

python3 app.py {41, 11} {51, 21}

We have taken three lists and convert them into sets and check the symmetric difference.

Finally, Python Set symmetric_difference() Method Example is over.

**See also**

Python set intersection_update()