Add values to a Python set

This post will discuss how to add values to a set in Python.

1. Add single element

To add an element to a set, the standard function is add(). The following example demonstrates this usage of add().

if __name__ == '__main__':

s = {1, 2, 3}

s.add(4)

s.add(5)

print(s) # {1, 2, 3, 4, 5}

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2. Add contents of another Iterable

If you need to add other iterable contents, you can use the update() function. The following code demonstrates how to add the contents of a list to a set.

if __name__ == '__main__':

s = {1, 2, 3}

l = [4, 5]

s.update(l)

print(s) # {1, 2, 3, 4, 5}

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3. Add another Set

You can also use the | operator (or |= operator) to concatenate two sets. Note this returns a new set, as shown below:

if __name__ == '__main__':

x = {1, 2, 3}

y = {4, 5}

s = x | y

print(s) # {1, 2, 3, 4, 5}

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You can also use the union() function to merge the contents of two sets and return a new set.

if __name__ == '__main__':

x = {1, 2, 3}

y = [4, 5]

s = x.union(y)

print(s) # {1, 2, 3, 4, 5}

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That’s all about adding values to a set in Python.

Add values to a Python set

1. Add single element

2. Add contents of another Iterable

3. Add another Set

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