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Python Set difference_update() Method

❮ Set Methods


Example

Remove the items that exist in both sets:

x = {"apple", "banana", "cherry"}
y = {"google", "microsoft", "apple"}

x.difference_update(y)

print(x)
Try it Yourself »

Definition and Usage

The difference_update() method removes the items that exist in both sets.

The difference_update() method is different from the difference() method, because the difference() method returns a new set, without the unwanted items, and the difference_update() method removes the unwanted items from the original set.

As a shortcut, you can use the -= operator instead, see example below.


Syntax

set.difference_update(set1, set2 ... etc.)

Parameter Values

Parameter Description
set1 Required. The set(s) to check for differences in.
set2 Optional. The other set to search for equal items in.
You can compare as many sets you like.
Separate the sets with a comma.
See examples below.

Shorter Syntax

set -= set1 | set2 ... etc.

Parameter Values

Parameter Description
set1 Required. The set(s) to check for differences in.
set2 Optional. The other set to search for equal items in.
You can compare as many sets you like.
Separate the sets with | (a pipe operator).
See examples below.

More Examples

Example

Use -= as a shortcut instead of difference_update():

a = {"apple", "banana", "cherry"}
b = {"google", "microsoft", "apple"}

a -= b

print(a)
Try it Yourself »

Example

Join more than two sets:

a = {"apple", "banana", "cherry"}
b = {"google", "microsoft", "apple"}
c = {"cherry", "micra", "bluebird"}

a.difference_update(b, c)

print(a)
Try it Yourself »

Example

Join more than two sets with the -= operator:

a = {"apple", "banana", "cherry"}
b = {"google", "microsoft", "apple"}
c = {"cherry", "micra", "bluebird"}

a -= b | c

print(myset)
Try it Yourself »

❮ Set Methods