Related Articles

Related Articles

Python Set | difference_update()
  • Difficulty Level : Medium
  • Last Updated : 07 Feb, 2018

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 two sets. The set difference() method will get the (A – B) and will return a new set. The set difference_update() method modifies the existing set. If (A – B) is performed, then A gets modified into (A – B), and if (B – A) is performed, then B gets modfied into (B – A).


A.difference_update(B) for (A - B)
B.difference_update(A) for (B - A)

The function returns None and changes the value of the existing set.
In this example, we will get the difference between two sets and show how the difference_update works.





# Python code to get the difference between two sets
# using difference_update() between set A and set B
# Driver Code
A = {10, 20, 30, 40, 80}
B = {100, 30, 80, 40, 60}
# Modifies A and returns None
# Prints the modified set
print (A)



{20, 10}

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :