Convert List to Set with Python

In Python, the easiest way to convert a list to a set is using the Python set() function.

l = [0,1,2,3]

converted_to_set = set(l)

print(converted_to_set)

#Output:
{0,1,2,3}

If your list has duplicates, set() will remove them.

l = [0,1,2,3,0,0,3]

converted_to_set = set(l)

print(converted_to_set)

#Output:
{0,1,2,3}

When working with collections of items in Python, it can be easier to convert them to other data structures to be able to work more efficiently.

We can convert lists to sets in Python easily.

A set is an unordered collection of unique elements. On the other hand, lists are ordered and can contain duplicates. Converting a list to a set creates a new set with the same items as the list and removes all duplicates removed.

To convert a list to a set using Python, we can use the set() function.

Below is an example of using the set() function to convert a list to a set.

l = [0,1,2,3]

converted_to_set = set(l)

print(converted_to_set)

#Output:
{0,1,2,3}

As mentioned above, sets do not allow for duplicate elements. Below is an example of how the set() function will remove duplicates when you convert a list to a set.

l = [0,1,2,3,0,0,3]

converted_to_set = set(l)

print(converted_to_set)

#Output:
{0,1,2,3}

Using a Loop to Convert List to Set in Python

We can also use loops to convert different collection of objects to a new data structure. With Python, we can convert lists to sets using loops easily.

Below is an example of how to us a for loop to convert a list to a set with Python.

l = [0,1,2,3]

new_set = set()

for x in l:
    new_set.add(x)

print(new_set)

#Output:
{0,1,2,3}

How to Convert a Set to a List in Python

If you want to do the reverse and convert a set to a list, you can use the Python list() function.

To convert a set to a list, we just pass the set variable to the list() function.

Below is an example in Python of how to convert a set to a list.

s = {0,1,2,3}

converted_to_list = list(s)

print(converted_to_list)

#Output:
[0,1,2,3]

Hopefully this article has been useful to convert lists to sets in your Python code.