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Python Set union() Method

❮ Set Methods


Return a set that contains all items from both sets, duplicates are excluded:

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

z = x.union(y)

Try it Yourself »

Definition and Usage

The union() method returns a set that contains all items from the original set, and all items from the specified set(s).

You can specify as many sets you want, separated by commas.

It does not have to be a set, it can be any iterable object.

If an item is present in more than one set, the result will contain only one appearance of this item.


set.union(set1, set2...)

Parameter Values

Parameter Description
set1 Required. The iterable to unify with
set2 Optional. The other iterable to unify with.
You can compare as many iterables as you like.
Separate each iterable with a comma

More Examples


Unify more than 2 sets:

x = {"a", "b", "c"}
y = {"f", "d", "a"}
z = {"c", "d", "e"}

result = x.union(y, z)

Try it Yourself »

❮ Set Methods