In this article we discuss about Python Lists.

Python Lists

Python Lists

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

Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage.

Lists are created using square brackets

Example

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

List Items

List items are ordered, changeable, and allow duplicate values.

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

Ordered

When we say that lists are ordered, it means that the items have a defined order, and that order will not change.

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

Note: There are some list methods that will change the order, but in general the order of the items will not change.

Changeable

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

Allow Duplicates

Since lists are indexed, lists can have items with the same value

Example

Lists allow duplicate values

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

List Length

To determine how many items a list has, use the len() function

Example

Print the number of items in the list

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

Python List Items Data Types

List items can be of any data type

Example

String, int and boolean data types

list1 = ["apple", "banana", "cherry"]
list2 = [1, 5, 7, 9, 3]
list3 = [True, False, False]

A list can contain different data types

Example

A list with strings, integers and boolean values

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

type()

From Python’s perspective, lists are defined as objects with the data type ‘list’

<class ‘list’>

Example

What is the data type of a list?

mylist = ["apple", "banana", "cherry"]
print(type(mylist))

The list() Constructor

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

Example

Using the list() constructor to make a List

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

Also Check out Python – Access List Items

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