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3 Best Practices for Python List extend method

Python lists are a versatile data type that can be used for many purposes. In this blog post, we will discuss the best practices for using the List extend method. We will also provide some examples of how to use this method in your own code.

syntax of Python list extend method

The List extend method is a powerful tool that can be used to add elements to a list. It will add each element of the iterable object to the end of the list. The iterable argument can be any iterable object, such as another list, a tuple, or a set.

The syntax for this method is as follows: list.extend(iterable). This method can be used to add one or more elements to the end of a list.

Example of Python List extend method

  1. In a Python console, create a list called my_list with the following content: my_list = [‘a’, ‘b’, ‘c’]
  2. Create another list called new_elements with the following content: new_elements = [‘d’, ‘e’, ‘f’]
  3. Add the elements of new_elements to the end of my_list using the extend method: my_list.extend(new_elements)
  4. Print the content of my_list to see the updated list: print(my_list)


The output of this code will be: [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’]. As you can see, the elements of new_elements have been added to the end of my_list.

Tips to use Python list extend method

There are a few things to keep in mind when using the extend method. First, the order of the elements in the iterable object will be preserved when they are added to the list. Second, the extend method does not return a new list – it modifies the existing list in place. Finally, if the iterable object is empty, the extend method will do nothing.

Now that we know how to use the extend method, let’s discuss some best practices for using this method.

Best practice to use Python list extend method

First, always remember to pass in an iterable object as the argument to extend. This can be another list, a tuple, or a set. If you try to pass in something that is not iterable, you will get an unexpected return.

Second, if you are adding multiple elements to a list at once, it is usually best to use the extend method instead of append . This is because append must create a new list for each element that is added, which can be inefficient.

Finally, keep in mind that the extend method modifies the list in place. If you want to create a new list with the added elements, you can use the following code:new_list = my_list + new_elements

This will create a new list that contains all of the elements of my_list and all of the elements of new_elements.

We hope this blog post has been helpful in understanding how to use the extend method. Remember to always pass in an iterable object and to use extend when adding multiple elements to a list. Thanks for reading!