Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Union() function in Python
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.
263 Views
To Continue Learning Please Login