mylist = ["apple", "banana", "cherry"]
Lists are used to store multiple items in a single variable.
Lists are created using square brackets:
Example-
Create a List:
thislist = ["apple", "banana", "cherry"]
print(thislist)
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.
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.
You can use the append() method to add an element to an array.
The list is changeable, meaning that we can change, add, and remove items in a list after it has been created.
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)
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))
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]
From Python's perspective, lists are defined as objects with the data type 'list':
Example-
What is the data type of a list?
mylist = ["apple", "banana", "cherry"]
print(type(mylist))
List items are indexed and you can access them by referring to the index number:
Example-
Print the second item of the list:
thislist = ["apple", "banana", "cherry"]
print(thislist[1])
To change the value of a specific item, refer to the index number:
Example-
Change the second item:
thislist = ["apple", "banana", "cherry"]
thislist[1] = "blackcurrant"
print(thislist)
To add an item to the end of the list, use the append() method:
Example-
Using the append() method to append an item:
thislist = ["apple", "banana", "cherry"]
thislist.append("orange")
print(thislist)
The remove() method removes the specified item.
Example-
Remove "banana":
thislist = ["apple", "banana", "cherry"]
thislist.remove("banana")
print(thislist)