## Intersection() function Python

**Python intersection() function **return a new set with an element that is common to all set

The intersection of two given sets is the largest set which contains all the elements that are **common** to both sets. The intersection of two given sets A and B is a set which consists of all the elements which are common to both A and B.

**Examples of intersection:**

Input:Let set A = {2, 4, 5, 6}and set B = {4, 6, 7, 8}

Output:{4,6}Explanation: Taking the common elements in both the sets, we get {4,6} as the intersection of both the sets.

**Python intersection() Syntax:**

set1.intersection(set2, set3, set4….)

In parameters, any number of sets can be given

**Python intersection()** **Return value:**

The intersection() function returns a set, which has the intersection of all sets(set1, set2, set3…) with set1. It returns a copy of set1 only if no parameter is passed.

**Python intersection() Example**

### Example 1: Working of set intersection()

- Python3

`# Python3 program for intersection() function` `set1 ` `=` `{` `2` `, ` `4` `, ` `5` `, ` `6` `}` `set2 ` `=` `{` `4` `, ` `6` `, ` `7` `, ` `8` `}` `set3 ` `=` `{` `4` `, ` `6` `, ` `8` `}` `# union of two sets` `print` `(` `"set1 intersection set2 : "` `,` ` ` `set1.intersection(set2))` `# union of three sets` `print` `(` `"set1 intersection set2 intersection set3 :"` `,` ` ` `set1.intersection(set2, set3))` |

**Output:**

set1 intersection set2 : {4, 6} set1 intersection set2 intersection set3 : {4, 6}

**Example 2: Python set intersection operator(&)**

we can also get intersection using & operator.

- Python3

`# Python3 program for intersection() function` `set1 ` `=` `{` `2` `, ` `4` `, ` `5` `, ` `6` `}` `set2 ` `=` `{` `4` `, ` `6` `, ` `7` `, ` `8` `}` `set3 ` `=` `{` `1` `, ` `0` `, ` `12` `}` `print` `(set1 & set2)` `print` `(set1 & set3)` `print` `(set1 & set2 & set3)` |

**Output:**

{4, 6} set() set()

### Example 3: Python set intersection opposite

symmetric_difference() is a opposite to the set.intersection() methods.

- Python3

`# Python3 program for intersection() function` `set1 ` `=` `{` `2` `, ` `4` `, ` `5` `, ` `6` `}` `set2 ` `=` `{` `4` `, ` `6` `, ` `7` `, ` `8` `}` `set3 ` `=` `{` `1` `, ` `0` `, ` `12` `}` `print` `(set1.symmetric_difference(set2))` `print` `(set1.symmetric_difference(set3))` `print` `(set2.symmetric_difference(set3))` |

**Output:**

{2, 5, 7, 8} {0, 1, 2, 4, 5, 6, 12} {0, 1, 4, 6, 7, 8, 12}

### Example 4: Python set intersection empty

- Python3

`set1 ` `=` `{}` `set2 ` `=` `{}` `# union of two sets` `print` `(` `"set1 intersection set2 : "` `,` ` ` `set` `(set1).intersection(` `set` `(set2)))` |

**Output:**

set1 intersection set2 : set()

Last Updated on March 1, 2022 by admin