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Python Set Union

Union basically represents all the distinct elements of the corresponding sets altogether.

Python Set union() method finds the union of the sets and represents a new set which contains all the items from the corresponding input sets.

Note: If a set contains an element that appears more than once, then the output represented contains only a single appearance of the particular element.

Syntax:

set1.union(set2, set3,......, setN)

Basic understanding of Python Set Union

info = {'Safa', 'Aman', 'Divya', 'Elen'}
info1 = {'Safa', 'Aryan'}

print(info.union(info1))

Output:

{'Aman', 'Safa', 'Divya', 'Aryan', 'Elen'}

Python Set Union using “|” operator

The “|” operator can also be used to find the union of the input sets.

info = {'Safa', 'Aman', 'Diya'}
info1 = {'Varun', 'Rashi', 54 }

print(info | info1)

Output:

{'Diya', 'Aman', 'Safa', 54, 'Varun', 'Rashi'}

Union of Multiple Python Sets

Either of the following techniques can be used to find the union of multiple sets:

  • Passing multiple sets as arguments to the union() method
  • By creating a chain of union() method calls

1. Union of multiple sets using multiple sets as arguments

info = {12, 14, 15, 17}
info1 = {35, 545}
info2 = {'Safa','Aman'}

print(info.union(info1, info2))

Output:

{'Safa', 17, 545, 35, 'Aman', 12, 14, 15}

2. Union of multiple sets by creating a chain of union() method calls

info = {12, 14, 15, 17}
info1 = {35, 545}
info2 = {'Safa','Aman'}

print(info.union(info1).union(info2))


Output:

{'Aman', 17, 545, 35, 'Safa', 12, 14, 15}

Conclusion

Thus, in this article, we have understood and implemented ways to find the union of sets in Python.


References