General Info

Info:

Lists are used to store multiple items in a single variable.

Lists are created with square brackets.

Example:

this_list = ["apple", "banana", "cherry"]
print(this_list)

List Items:

• List items are:
  • ordered
  • changeable
  • allow dupplicate values

List items are indexed. The first item has index [0] , the second item has index [1] ..etc.

List items are ordered:

This means that the items have adefined order, and the order will not change.

If you add new items to a list, the new items will be placed at the end of the list.

List items are changeable:

The list is changeable, meaning that we can change, add and remove items in a list after it has been created.

Allow dupplicates:

Since lists are indexed, lists can have items with the same value. Here's an example below:

this_list = ["apple", "banana", "cherry", "apple", "cherry"]
print(this_list)

List Length:

To determine how many items a list has, use the len() function. Here's an example:

thislist = ["apple", "banana", "cherry"]
print(len(thislist))

And the code above will give this output below:

3

So it counts the item numbers?

Data Types:

A List can contain items of any data type and you can also put them together, so it can contain different data types as well. Here's an example:

list1 = ["abc", 34, True, 40, "male"]

type()

From Python's perspective, lists are defined as objects with the data type 'list' :

<class 'list'>

list() Constructor:

It is also possible to use the list() constructor when creating a new list.

Here' s an example:

thislist = list(("apple", "banana", "cherry")) # note the double round-brackets  
print(thislist)