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10.2. List Values

There are several ways to create a new list. The simplest is to enclose the elements in square brackets ( [ and ]).

[10, 20, 30, 40]
["spam", "bungee", "swallow"]

The first example is a list of four integers. The second is a list of three strings. As we said above, the elements of a list don’t have to be the same type. The following list contains a string, a float, an integer, and another list.

["hello", 2.0, 5, [10, 20]]

A list within another list is said to be nested and the inner list is often called a sublist. Finally, there is a special list that contains no elements. It is called the empty list and is denoted [].

As you would expect, we can also assign list values to variables and pass lists as parameters to functions.

vocabulary = ["iteration", "selection", "control"] numbers = [17, 123] empty = [] mixedlist = ["hello", 2.0, 5*2, [10, 20]] print(numbers) print(mixedlist) newlist = [ numbers, vocabulary ] print(newlist)

Check your understanding

A list can contain only integer items.

• False
• Yes, unlike strings, lists can consist of any type of Python data.
• True
• Lists are heterogeneous, meaning they can have different types of data.

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