In this article, we will be learning about union() i.e. one of the operations performed on the set() type. Union of all input sets is the smallest set which contains the elements from all sets excluding the duplicate elements present in sets.
Syntax
<set_1>.union(<set_2>,<set_3>.......)
Return type − <’set’> type
Symbol − It is denoted by the first letter of function i.e. ‘U’ in probability
Example
# Python 3.x. set union() function
set_1 = {'a','b'}
set_2 = {'b','c','d'}
set_3 = {'b','c','d','e','f','g'}
# union operation on two sets
print("set_1 U set_2 : ", set_1.union(set_2))
print("set_3 U set_2 : ", set_2.union(set_3))
print("set_1 U set_3 : ", set_1.union(set_3))
# union operation on three sets
print("set_1 U set_2 U set_3 :", set_1.union(set_2, set_3))Output
set_1 U set_2 : {'a', 'd', 'c', 'b'}
set_3 U set_2 : {'e', 'c', 'd', 'b', 'f', 'g'}
set_1 U set_3 : {'e', 'c', 'd', 'b', 'a', 'f', 'g'}
set_1 U set_2 U set_3 : {'e', 'c', 'd', 'b', 'a', 'f', 'g'}The output indicates that duplicate elements are not counted while forming the output.
Alternate syntax for implementing set operations.
Example
# Python 3.x. set union() function
set_1 = {'a','b'}
set_2 = {'b','c','d'}
set_3 = {'b','c','d','e','f','g'}
# union operation on two sets
print("set_1 U set_2 : ", set_1|set_2)
print("set_3 U set_2 : ", set_2|set_3)
print("set_1 U set_3 : ", set_1|set_3)
# union operation on three sets
print("set_1 U set_2 U set_3 :", set_1|set_2|set_3)The output produced by the above code is identical to one discussed the previous illustration. Here instead of implementing .union() we use this symbol “|” which has the identical functionality.
Union operator can also be used for lists by converting them to set() type using explicit type casting
Syntax
list(set(lst_1) | set(lst_2))
Conclusion
In this article, we learnt about union() function and its working on set & list type of data structures.