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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).

Syntax:

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.



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# 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
A.difference_update(B)
  
# Prints the modified set
print (A)

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Output:

{20, 10}

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