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# What is the difference between operator and method on Python set?

Python's set object represents built-in set class. Different set operations such as union, intersection, difference and symmetric difference can be performed either by calling corresponding methods or by using operators.

## Union by method

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1.union(s2) {1, 2, 3, 4, 5, 6, 7, 8} >>> s2.union(s1) {1, 2, 3, 4, 5, 6, 7, 8}

## Union by | operator

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1|s2 {1, 2, 3, 4, 5, 6, 7, 8}

## Intersection by method

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1.intersection(s2) {4, 5} >>> s2.intersection(s1) {4, 5}

## Intersection & operator

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1&s2 {4, 5} >>> s2&s1 {4, 5}

## Difference method

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1.difference(s2) {1, 2, 3} >>> s2.difference(s1) {8, 6, 7}

## Difference - operator

>>> s1={1,2,3,4,5} >>> s2={4,5,6,7,8} >>> s1-s2 {1, 2, 3} >>> s2-s1 {8, 6, 7}

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