Python List extend()

In this tutorial, you will learn about the python list’s extend() method using some examples.

In exetend() method you can add elements from other iterables to the end of the current list.

The syntax of extend() method is:

list.extend(iterable)

Python List extend()

We can only take any iterable as argument in extend() method.

Let see an example of python list’s extend() method.

Example 1: How to use extend() method in python list?

first_list = [1,2,3,4,5]
second_list = ['six','seven','eight']

print(first_list)
print(second_list)

#using extend() method

first_list.extend(second_list)

print(first_list)

The output will be as follow.

[1, 2, 3, 4, 5]
['six', 'seven', 'eight']
[1, 2, 3, 4, 5, 'six', 'seven', 'eight']

We can also add elements from other object like tuple, set,

Example 2: Using list extend() method with other iterables.

first_list = [1,2,3,4,5]
second_tuple = ('six','seven','eight')
third_set = {9,10,11}

print("This list is:",first_list)
print("The tuple look like:",second_tuple)
print("The set looks like :",third_set)

#using extend() method

first_list.extend(second_tuple)

print("List after adding tuple:", first_list)

first_list.extend(third_set)

print("Final list after adding set will be:",first_list)

Output:

This list is: [1, 2, 3, 4, 5]
The tuple look like: ('six', 'seven', 'eight')
The set looks like : {9, 10, 11}
List after adding tuple: [1, 2, 3, 4, 5, 'six', 'seven', 'eight']
Final list after adding set will be: [1, 2, 3, 4, 5, 'six', 'seven', 'eight', 9, 10, 11]

Rules of python list extend()

There is no such rule to implement extend() method but it takes only iterable as an argument.