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Python Methods and Functions

The update () function in the set adds elements from the 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:

# Python program for demonstration
# using the 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 updated set

print (set1) 

 

  
# The list is passed as a parameter that
# automatically converted to set
set1.update (list3) 

print (set1)

Output:

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

Code # 2:

# Python program for demonstration
# using the update () method

 

list1 = [ 1 , 2 , 3 , 4

list2 = [ 1 , 4 , 2 , 3 , 5

alphabet_set = { 'a' , 'b' , ' c' }

 
# lists converted to nabs ora

set1 = set (list2) 

set2 = set (list1)

 
# Update method
set1.update (set2) 

  
# Print the updated set

print (set1) 

 
set1.update (alphabet_set )

print (set1)

Output:

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




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