Learn Python by Building Data Science Applications

Lists

Lists are probably the most frequently used type of data structure in Python. A list is a simple and ordered 1D array of elements. Each element has its own index number, starting with 0, so the last element always has an index of L-1, where L is the number of elements in the list. Lists can store any mix of data types. They can also store any other data structure. For example, a matrix (2D array) can be represented as a list of lists, or a 3D matrix can be represented as a list of lists of lists. Lists are dynamic, which means you can add or drop items in any number, or even change their order in place, without rebuilding the list from scratch.

You can create a new list by using the list() function, or by using square brackets, with ...