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Intersection() function Python

  • Difficulty Level : Easy
  • Last Updated : 05 Oct, 2021
Geek Week

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()

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