Python set intersection_update(): Keep Common Elements In Place

A.intersection_update(*others) keeps in A only elements that are also present in every supplied iterable. It returns None and modifies the original set in place.

Use intersection() when you want a new set instead of changing the original mutable set.

Set order: sets are unordered. Whenever an example prints a set, the displayed element order can differ between runs or Python environments.

Using intersection_update() method

A={'a','b','c'}
B={'a','y','z'}
A.intersection_update(B)
print(A)

Output

{'a'}

Using More Than Two Sets

We can use any number of sets with intersection_update()

A={'a','b','c'}
B={'a','y','z'}
C={'a','k','l'}
A.intersection_update(B,C)
print(A)

Output

{'a'}

intersection_update() method

Using string ( iterable object ) with intersection_update() method

A={'a','b','c','x','y'}
B='Alex'
A.intersection_update(B)
print(A)

Output

{'x'}

Using list with intersection_update() method.

A={'a','b','c'}
B=['a','x','y']
A.intersection_update(B)
print(A)

Output

{'a'}

All Set Methods Updating Set Operations Questions with solutions on set
intersection() union() difference() symmetric_difference()

tuple set Dictionary Python- Tutorials

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Python set intersection_update() Method

Using intersection_update() method

Using More Than Two Sets

intersection_update() method

Subhendu Mohapatra