List Introduction

An introduction to the List data type in Python

List Introduction

A list is a mutable, or changeable, ordered sequence of elements. Each element or value that is inside of a list is called an item. Just as strings are defined as characters between quotes, lists are defined by having values between square brackets [ ].

A list of integers looks like this:

[-3, -2, -1, 0, 1, 2, 3]

A list of floats looks like this:

[3.14, 9.23, 111.11, 312.12, 1.05]

A list of strings:

['shark', 'cuttlefish', 'squid', 'mantis shrimp']

If we define our string list as sea_creatures:

sea_creatures = ['shark', 'cuttlefish', 'squid', 'mantis shrimp']

We can print them out by calling the variable:


And we see that the output looks exactly like the list that we created:

['shark', 'cuttlefish', 'squid', 'mantis shrimp']

Lists are a very flexible data type because they are mutable in that they can have values added, removed, and changed. There is a data type that is similar to lists but that can’t be changed, and that is called a tuple.


Write a program that displays on screen a list of five items.

Write a program that displays on screen two list of differing data types.

Write a program to see if two lists are identical using Boolean Logic.

4.1 Lists Introduction Task
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