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Python Lists

Operations
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List Operations
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Documentation
schedule Jul 1, 2022
Last updated
local_offer Python
Tags

A list is a collection of elements in a particular order. In Python, a list is represented by square brackets [].

# List of fruits
fruits = ["apple", "orange","pear"]
print(fruits)
['apple', 'orange', 'pear']

Note that when you print a list, the square brackets are also returned.

Examples

Accessing elements in a list

We can access a particular element in a list by its index position:

fruits = ["apple", "orange","pear"]
print(fruits[1])
orange
NOTE

Note index positions start at 0 not 1. Therefore by specifying fruits[1] we returned the second item in list fruits.

We can return the last item in a list by specifying index of -1:

fruits = ["apple", "orange","pear"]
print(fruits[-1])
pear

This method is useful when you do not know the length of the list you are working with.

Modifying elements in a list

We can also use index notation to modify elements in a list:

fruits = ["apple", "orange","pear"]
fruits[1] = "raspberry"
print(fruits)
['apple', 'raspberry', 'pear']

The second element in the list "orange" has been replaced with new value "raspberry".

Slicing a list

To create a slice of the second and third items in a list:

fruits = ["apple", "orange","pear"]
fruits[1:3]
['orange', 'pear']

fruits[1:3] gets elements of fruits starting from index 1 up until but not including index 3.

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Published by Arthur Yanagisawa
Edited by 0 others
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