Python Get All Unique Elements in a List

Python3 Examples

In Python, we can use multiple methods to get all unique elements in a list. The most common method is to useset, because a set automatically removes duplicate elements. Here is a simple example:

Code explanation:

1. my_listis a list containing duplicate elements.
2. set(my_list)Convert the list to a set, and the set will automatically remove duplicate elements.
3. list(set(my_list))Convert the set back to a list so that we can get a list containing only unique elements.
4. print(unique_elements)Print the result.

Output result:

[1, 2, 3, 4, 5]

This method is simple and efficient, and is suitable for most cases. If you need to preserve the order of elements, you can use thedict.fromkeys()method:

Code explanation:

1. dict.fromkeys(my_list)Create a dictionary. The keys of the dictionary are the elements in the list. Since dictionary keys are unique, duplicate elements are automatically removed.
2. list(dict.fromkeys(my_list))Convert the dictionary keys back to a list.
3. print(unique_elements)Print the result.

Output result:

[1, 2, 3, 4, 5]

This method removes duplicate elements while maintaining the original order of elements.

Python3 Examples