How to append a list, tuple or set to a set in python

Appending a list, tuple or set to a python set:

Python sets are used to store non-duplicate, unique elements. It is mutable. We can edit it and append data to it. set gives one method called add to add one single element to a set. Another method called update can be used to add multiple elements from another list, tuple or set. In this post, we will learn how to append items from a list, tuple or set to a python set.

Definition of update:

update method is defined as below:

given_set.update(param)

Here, param can be a set, list, tuples or dictionary. This method returns nothing. It only adds the items to the set given_set.

Example of adding list items to set in python:

Let’s take a look at the below example:

given_list = [1, 2, 3]
given_set = {4, 5, 6}

given_set.update(given_list)

print(given_set)

Here,

given_list is a list of numbers
given_set is a set with three numbers
We are using update to append the values of given_list to given_set.
The last line is printing the values of given_set which also includes the values of given_list.

If you run this program, it will give the below output:

{1, 2, 3, 4, 5, 6}

Now, let’s try to add some duplicate items to the set.

given_list = [1, 2, 3]
given_set = {2, 3, 4, 5, 6}

given_set.update(given_list)

print(given_set)

If you run it, it will give the same output. Because, we can’t have duplicate values in a python set.

Example of appending tuple to a set in python:

Let’s try to append a tuple to a set:

given_tuple = (1, 2, 3)
given_set = {2, 3, 4, 5, 6}

given_set.update(given_tuple)

print(given_set)

Here,

given_tuple is a tuple with three numbers
given_set is a set with five numbers.
We are using update to add the numbers of tuple in the set.

If you run this program, it will print the same output.

Example of appending set to a set in python:

The below example appends the numbers of one set to another set:

first_set = {1, 2, 3}
second_set = {2, 3, 4, 5, 6}

first_set.update(second_set)

print(first_set)

It is appending the values of second_set to first_set. It prints the same output.

CodeVsColor