How to Copy a List in Python?

Estimated read time 2 min read

To copy a list in Python, there are several methods you can use depending on the specific requirements of your use case.

Method 1: Using the Slicing Operator

One of the simplest ways to copy a list in Python is to use the slicing operator. Here’s an example:

original_list = [1, 2, 3, 4, 5]
copied_list = original_list[:]

In this example, we create a new list called copied_list by slicing the original_list from the beginning to the end (i.e., [:]). This creates a new list with the same elements as the original list and assigns it to the copied_list variable.

Method 2: Using the list() Constructor

Another way to copy a list is to use the list() constructor. Here’s an example:

original_list = [1, 2, 3, 4, 5]
copied_list = list(original_list)

In this example, we create a new list called copied_list by passing the original_list as an argument to the list() constructor. This creates a new list with the same elements as the original list and assigns it to the copied_list variable.

Method 3: Using the copy() Method

Python also provides a copy() method for lists that allows you to create a copy of the list. Here’s an example:

original_list = [1, 2, 3, 4, 5]
copied_list = original_list.copy()

In this example, we create a new list called copied_list by calling the copy() method on the original_list. This creates a new list with the same elements as the original list and assigns it to the copied_list variable.

All of these methods create a new list with the same elements as the original list. However, keep in mind that if the original list contains mutable objects, such as other lists or dictionaries, these objects will be passed by reference, and any changes made to them in the copied list will also affect the original list. If you want to create a deep copy of a list that contains mutable objects, you can use the copy module’s deepcopy() function, as I have explained in a previous answer.

You May Also Like

More From Author

+ There are no comments

Add yours

Leave a Reply