Python Set | update()
Python update() function in set adds elements from a set (passed as an argument) to the set.
Syntax : set1.update(set2)
Here set1 is the set in which set2 will be added.
Parameters : Update() method takes any number of argument. The arguments can be a set, list, tuples or a dictionary. It automatically converts into a set and adds to the set.
Return value : This method adds set2 to set1 and returns nothing.
Example of Python set update()
Example 1: Working with Python set update list
Python3
# Python program to demonstrate the# use of update() methodlist1 = [1, 2, 3]list2 = [5, 6, 7]list3 = [10, 11, 12]# Lists converted to setsset1 = set(list2)set2 = set(list1)# Update methodset1.update(set2)# Print the updated setprint(set1)# List is passed as an parameter which# gets automatically converted to a setset1.update(list3)print(set1) |
Output :
{1, 2, 3, 5, 6, 7}
{1, 2, 3, 5, 6, 7, 10, 11, 12}
Example 2: Python set update element in set
Python3
# Python program to demonstrate the# use of update() methodlist1 = [1, 2, 3, 4]list2 = [1, 4, 2, 3, 5]alphabet_set = {'a', 'b', 'c'}# lists converted to setsset1 = set(list2)set2 = set(list1)# Update methodset1.update(set2)# Print the updated setprint(set1)set1.update(alphabet_set)print(set1) |
Output :
{1, 2, 3, 4, 5}
{1, 2, 3, 4, 5, 'c', 'b', 'a'}
Example 3: Add elements of the dictionary to Set
Python3
number = {1, 2, 3, 4, 5}num_Dict = {6: 'Six', 7: 'Seven', 8: 'Eight', 9: 'Nine', 10: 'Ten'}number.update(num_Dict)print("Updated set: ", number) |
Output:
Updated set: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
