
        
        
            
                
                
                    a = {1, 2, 3}
a.discard(3)
print(a)
                
            
            {1, 2}

No exception is raised if the element we try to remove does not exist:


        
        
            
                
                
                    a = {1, 2, 3}
a.discard(4)
print(a)
                
            
            {1, 2, 3}

Remove method

Removing the element 3 from set a:


        
        
            
                
                
                    a = {1, 2, 3}
a.remove(3)
print(a)
                
            
            {1, 2}

An exception is raised if the element we try to remove does not exist:


        
        
            
                
                
                    a = {1, 2, 3}
a.remove(4)   # Causes an error!
print(a)
                
            
            ---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)

Removing multiple elements

To remove multiple elements, use the different_update(~) method:


        
        
            
                
                
                    set_of_num = set([5,3,1])
to_delete = [1,2,4,5]
set_of_num.difference_update(to_delete)
print(set_of_num)
                
            
            {3}

Equivalently, we can use the - operator with another set:


        
        
            
                
                
                    set_of_num = set([5,3,1])
to_delete = set([1,2,4,5])
print(set_of_num - to_delete)
                
            
            {3}

Published by Arthur Yanagisawa

Edited by 0 others

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