Swipe to show menu

Working with Nested Lists in Python

Items within a list in Python can also be lists. This forms what is called a "nested list" or "lists within lists." Nested lists are powerful in organizing elaborative data structures in that you can store multiple-level data within one list.

For instance, you might have a list where some elements are just single values, and others might be lists themselves. Here's a simple example:


              123
            
cities = ["London", ["Paris", "Madrid"], "Rome", ["Bangkok", ["New York", "Los Angeles"]]]

print(cities)

Using Variables for Nested Lists

This example illustrates a nested list in which the second and fourth elements are also lists, and the fourth element even contains another nested list within it.

You can also create nested lists by concatenating lists held in variables. This can be useful to make your code more readable. For instance:


              1234567
            
europe_cities = ["Paris", "Berlin", "Rome"]
asia_cities = ["Tokyo", "Seoul", "Bangkok"]
america_cities = ["New York", "Los Angeles", "Chicago"]

world_cities = [europe_cities, asia_cities, america_cities]

print(world_cities)

Here, we first define three independent lists for cities in Europe, Asia, and the Americas. We then combine the lists into one, world_cities, which becomes a nested list.

The example shows that a nested list is a good way to organize related data, such as cities from different continents, in a natural, intuitive, and organized manner.

Task

Swipe to start coding

Fill the travel_wishlist list with nested lists.

Each nested list should contain 3 elements: City, Country, and approximate trip cost.
The travel_wishlist list should contain 3 nested lists with information about cities.

For example, you can use the following data:

Note

You can add more cities as nested lists, but make sure that their elements are defined in the proper format.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 3

Ask AI

Ask anything or try one of the suggested questions to begin our chat

Working with Nested Lists in Python

For instance, you might have a list where some elements are just single values, and others might be lists themselves. Here's a simple example:


              123
            
cities = ["London", ["Paris", "Madrid"], "Rome", ["Bangkok", ["New York", "Los Angeles"]]]

print(cities)

Using Variables for Nested Lists

This example illustrates a nested list in which the second and fourth elements are also lists, and the fourth element even contains another nested list within it.

You can also create nested lists by concatenating lists held in variables. This can be useful to make your code more readable. For instance:


              1234567
            
europe_cities = ["Paris", "Berlin", "Rome"]
asia_cities = ["Tokyo", "Seoul", "Bangkok"]
america_cities = ["New York", "Los Angeles", "Chicago"]

world_cities = [europe_cities, asia_cities, america_cities]

print(world_cities)

Here, we first define three independent lists for cities in Europe, Asia, and the Americas. We then combine the lists into one, world_cities, which becomes a nested list.

The example shows that a nested list is a good way to organize related data, such as cities from different continents, in a natural, intuitive, and organized manner.

Task

Swipe to start coding

Fill the travel_wishlist list with nested lists.

Each nested list should contain 3 elements: City, Country, and approximate trip cost.
The travel_wishlist list should contain 3 nested lists with information about cities.

For example, you can use the following data:

Note

You can add more cities as nested lists, but make sure that their elements are defined in the proper format.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 3

Switch to desktop for real-world practiceContinue from where you are using one of the options below