2.1 Tutorials on using Dictionary and List data structure

In this tutorial, you will learn how to use the Dictionary and List blocks. All data returned by CAIT's A.I. blocks are represented by either a dictionary, a list, or a combination of both. Therefore, it is important for you to fully understand how to use these blocks.

Dictionary

A dictionary is a data structure that acts as a collection of key-value pairs. For example, a dictionary called SongsAndNumbers can have the following form:

{
 'Imagine': 'John Lennon',
 'Hey Jude': 'The Beatles',
 'Yesterday': 'The Beatles',
 'Smells Like Teen Spirit': 'Nirvana',
 'One': 1,
 'Two': 2
}

In the above SongsAndNumbers dictionary, the key can be the name of a song, e.g. 'Imaging', and the value is the singer of that song, e.g. 'John Lennon'. Or the key can be the English name of a number, e.g. "One", and the value is the number itself, e.g. 1. This key and value correspondence is called key-value pair, and a dictionary can contain a multiple of these key-value pairs.