Python

Intersection method in set

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Intersection method in set - Python

This method returns a new set containing all common elements from all of the set and all elements are unique in the new set.

If there are no common elements among all the set it returns an empty set.

This method can take zero to any number of collection or iterable types (e.g. list, tuple, dictionary, set, string) of data as an argument.

When you call the intersection method with a set and pass one set as an argument. first it creates a new set(result set) and then finds the common elements if the element is common in both sets then it adds that element to the new set(result set).

After traversing all the elements it returns the new set(result set).

If we call the intersection method with a zero argument then it returns the shallow copy of the set(the set which is called with the intersection).

It returns an empty if there are no common elements in the sets.

You can also use & operator in place of .intersection() method.

Syntax –

set_name.intersection(iterable1,iterable2,iterable3,...)

Parameters –

iterable → any number of collections or iterable elements.

return value → returns a new set.

Example –

				
					set1={1,2,3,4,5}
set2={3,4,5,6,7}
print("Set 1:",set1)
print("Set 2:",set2)
s=set1.intersection(set2)
print("Resultant set:",s)

# Output -
# Set 1: {1, 2, 3, 4, 5}
# Set 2: {3, 4, 5, 6, 7}
# Resultant set: {3, 4, 5}

In the above example ,first we create two sets set1, set2 with elements.

After creating sets print both the sets on the output screen.

After that, we call the intersection method with set1 pass set2 as an argument and store the return value in variable s.

print the resultant set s on the output screen.

Here we can also change the position of set1 to set2.

Intersection method with no argument –

Example –

				
					s={'Hello','Everyone','this','is','edSlash'}
print("Set 1:",s)
s1=s.intersection(s1)
print("Resultant set:",s1)

# Output -
# Set 1: {'Hello','Everyone','this','is','edSlash'}
# Resultant set: {'Hello','Everyone','this','is','edSlash'}

Intersection with two arguments or intersection of three sets –

Example –

				
					s={11,12,13,14,15}
s1={12,14,16,11}
s2={11,13,14}
print(s)
print(s1)
print(s2)
resultant_set=s.intersection(s1,s2)
print("resultant set:",resultant_set)

# Output -
# {11, 12, 13, 14, 15}
# {16, 11, 12, 14}
# {11, 13, 14}
# resultant set: {11, 14}

Intersection with no common elements –

Example –

				
					my_set1={10,20,30,40,50}
my_set2={'A','B','C','D','E'}
print("Set 1:",my_set1)
print("Set 2:",my_set2)
s=my_set1.intersection(my_set2)
print("Resultant set:",s)

# Output -
# Set 1: {50, 20, 40, 10, 30}
# Set 2: {'A', 'C', 'D', 'E', 'B'}
# Resultant set: set()

Intersection with another type of iterable or collection element e.g. list, tuple, dictionary, string-

Example –

				
					my_set={'a','b','c','f','g','h'}
my_list=['a','b','c','d','e']
my_tuple=('a','b','c')
my_dict={'a':12,'b':15}
my_string='ab'
returned_set=my_set.intersection(my_list,my_tuple,my_dict,my_string)
print('set:',my_set)
print('list:',my_list)
print('tuple:',my_tuple)
print('dictionary:',my_dict)
print('string:',my_string)
print('Resultant set:',returned_set)

# Output -
# set: {'c', 'h', 'f', 'a', 'b', 'g'}
# list: ['a', 'b', 'c', 'd', 'e']
# tuple: ('a', 'b', 'c')
# dictionary: {'a': 12, 'b': 15}
# string: ab
# Resultant set: {'a', 'b'}

Intersection using & operator –

Example –

				
					Science_stream_subject={'Hindi','English','Math','Physics','Chemistry'}
Commerce_stream_subject={'Hindi','English','Accountancy','Business Studies','Economics'}
print("Science stream subject:",Science_stream_subject)
print("Commerce stream subject:",Commerce_stream_subject)
common_subject=Commerce_stream_subject & Science_stream_subject
print("Common subject:",common_subject)

# Output -
# Science stream subject: {'Hindi', 'English', 'Chemistry', 'Math', 'Physics'}
# Commerce stream subject: {'Business Studies', 'Economics', 'English', 'Accountancy', 'Hindi'}
# Common subject: {'Hindi', 'English'}

Python

Intersection method in set

Intersection method in set - Python

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