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Intersection() function Python
  • Difficulty Level : Easy
  • Last Updated : 06 Feb, 2018

Intersection of two given sets is the largest set which contains all the elements that are common to both the sets. 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:

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.

Syntax:

set1.intersection(set2, set3, set4….)
In parameters, any number of sets can be given



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.

Below is the Python3 implementation of the above approach:

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# 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))

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Output:

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

Practical applications:
In most of the probability problems, the concept of intersection of sets is needed.

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