Python set update() Method

set.update(*iterables) adds the elements produced by one or more iterables to an existing set and returns None. Duplicate values are stored only once.

Because a set is mutable, update() changes it in place. Use add() when you want to add one hashable object as a single element.

my_set={'a','b','c','x'}
my_set2={'x','y','z'}
my_set.update(my_set2)
print(my_set)

{'z', 'a', 'x', 'y', 'b', 'c'}

Adding a string

my_set={'a','b','c','x'}
text='alex'
my_set.update(text)
print(my_set)

{'a', 'b', 'c', 'x', 'l', 'e'}

Adding a list

my_set={'a','b','c','x'}
my_list=['x','y','z']
my_set.update(my_list)
print(my_set)

{'z', 'a', 'y', 'b', 'x', 'c'}

Adding a tuple

my_set={'a','b','c','x'}
my_tuple=('x','y','z')
my_set.update(my_tuple)
print(my_set)

{'z', 'a', 'y', 'b', 'x', 'c'}

Difference between add() and update()

Subhendu Mohapatra

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