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Python Set | update()
  • Difficulty Level : Basic
  • Last Updated : 08 Jan, 2018

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 only a single argument. The single argument 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.

Code #1 :



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# Python program to demonstrate the  
# use of update() method 
  
  
list1 = [1, 2, 3
list2 = [5, 6, 7
list3 = [10, 11, 12]
  
# Lists converted to sets 
set1 = set(list2) 
set2 = set(list1)
  
# Update method 
set1.update(set2)
   
# Print the updated set 
print(set1) 
  
  
# List is passed as an parameter which 
# gets automatically converted to a set 
set1.update(list3) 
print(set1)

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Output :

{1, 2, 3, 5, 6, 7}
{1, 2, 3, 5, 6, 7, 10, 11, 12}

 
Code #2 :

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# Python program to demonstrate the 
# use of update() method 
  
list1 = [1, 2, 3, 4
list2 = [1, 4, 2, 3, 5
alphabet_set = {'a', 'b', 'c'}
  
# lists converted to sets 
set1 = set(list2) 
set2 = set(list1)
  
# Update method 
set1.update(set2) 
  
# Print the updated set 
print(set1) 
  
set1.update(alphabet_set)
print(set1)

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Output :

{1, 2, 3, 4, 5}
{1, 2, 3, 4, 5, 'c', 'b', 'a'}

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