Python Set update() method

Python Set update() method

The set.update() method in Python updates the current set, by adding items from another set. If an element is common in both the sets, only one appearance of this item will be updated in the original set.

Syntax

set.update(set1)

Parameter

set- This parameter represents the main set.

set1- This argument signifies the other set to search for equal items.

Return

None

Example 1

# Python program explaining
# the set.update() method 
#initializing set1
set1 = {"mango", "banana", "apple","tomato"}
print("Set 1:",set1)
# initializing set2
set2 = {"potato", "spinach","Carrot", "apple"}
print("Set 2:",set2)
# updates the current set1, by adding items from set2
set1.update(set2) 
print("After the update() method...")
print("Updated Set 1:",set1)
print("Set 2:",set2) 

Output

Set 1: {'tomato', 'apple', 'banana', 'mango'}
Set 2: {'apple', 'Carrot', 'spinach', 'potato'}
After the update() method... 
Updated Set 1: {'apple', 'tomato', 'potato', 'Carrot', 'mango', 'spinach', 'banana'}
Set 2: {'apple', 'Carrot', 'spinach', 'potato'} 

Example 2

# Python program explaining
# the set.update() method 
# initializing set A
A = {"a","b","c","v"} 
print("Set A:",A)
#initializing B
B = {"a","b","c","h","k","r"}
print("Set B:",B) 
#the common items will have only one appearance in Set A
A.update(B)
print("\nUpdated A:",A)
print("Set B:",B) 

Output

Set A: {'b', 'a', 'v', 'c'}
Set B: {'k', 'h', 'r', 'a', 'b', 'c'}
Updated A: {'k', 'h', 'v', 'r', 'a', 'b', 'c'}
Set B: {'k', 'h', 'r', 'a', 'b', 'c'}