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Python .append() and .extend() Methods

Learn how to use the .append() and .extend() methods to add elements to a list.

The .append() method increases the length of the list by one, so if you want to add only one element to the list, you can use this method.

x = [1, 2, 3]
x.append(4)
x
[1, 2, 3, 4]

The .extend() method increases the length of the list by the number of elements that are provided to the method, so if you want to add multiple elements to the list, you can use this method.

x = [1, 2, 3]
x.extend([4, 5])
x
[1, 2, 3, 4, 5]

Exercise

TRY IT YOURSELF: Access the exercise in our Introduction to Python for Finance course here.

  • Add a single element, 'Amazon.com', to the names.
  • Add the list more_elements which consists of two elements to names.
# Append a name to the list names
names.____('Amazon.com')
print(names)

# Extend list names
more_elements = ['DowDuPont', 'Alphabet Inc']
names.____(____)
print(names)

Video

To learn more about list methods and functions, please see this video from our course Introduction to Python for Finance.

This content is taken from DataCamp’s Introduction to Python for Finance course by Adina Howe.