How to include items to a list in Python

2 years ago

Liam

3 minutes

In this section, we will provide an introduction.

In this guide, we will explore various methods of including items to a Python list.

Python offers four different techniques for adding elements to a List.

List Concatenation: The + operator can be used to combine multiple lists and generate a new list.

Info

Utilize Silicon Cloud App Platform to effortlessly launch your Python applications from GitHub, allowing Silicon Cloud to handle the app’s scalability.

Requirements

To finish this tutorial, you will require:

Familiarity with installing Python 3. And familiarity with coding in Python. How to Code in Python 3 series or using VS Code for Python.

I have personally verified that this tutorial works well with Python 3.9.6.

add to

This operation appends one element to the end of the list.

fruit_list = ["Apple", "Banana"]

print(f'Current Fruits List {fruit_list}')

new_fruit = input("Please enter a fruit name:\n")

fruit_list.append(new_fruit)

print(f'Updated Fruits List {fruit_list}')

The result:

Current Fruits List ['Apple', 'Banana']
Please enter a fruit name:
Orange
Updated Fruits List ['Apple', 'Banana', 'Orange']

The list was extended by including Orange at the end.

add in

This operation inserts an element into the list at the specified index.

num_list = [1, 2, 3, 4, 5]

print(f'Current Numbers List {num_list}')

num = int(input("Please enter a number to add to list:\n"))

index = int(input(f'Please enter the index between 0 and {len(num_list) - 1} to add the number:\n'))

num_list.insert(index, num)

print(f'Updated Numbers List {num_list}')

Result:

Current Numbers List [1, 2, 3, 4, 5]
Please enter a number to add to list:
20
Please enter the index between 0 and 4 to add the number:
2
Updated Numbers List [1, 2, 20, 3, 4, 5]

In this instance, the number 20 was included at position 2 within the list.

expand()

This function appends elements from an iterable to the list.

extend_list = []

extend_list.extend([1, 2])  # extending list elements

print(extend_list)

extend_list.extend((3, 4))  # extending tuple elements

print(extend_list)

extend_list.extend("ABC")  # extending string elements

print(extend_list)

One possible paraphrase is: “The result:”

[1, 2]
[1, 2, 3, 4]
[1, 2, 3, 4, 'A', 'B', 'C']

In this illustration, a series of elements [1, 2] was included. Following that, a tuple (3, 4) was appended. Lastly, a string ABC was appended as well.

Combining lists

To merge several lists, you can utilize the + operator, creating a fresh list while leaving the original lists unaffected.

evens = [2, 4, 6]
odds = [1, 3, 5]

nums = odds + evens

print(nums)  # [1, 3, 5, 2, 4, 6]

The given instance appended the list of even numbers to the list of odd numbers. The resulting list will have elements in the order they appear in the original lists. This operation resembles Python’s string concatenation.

In summary

Python has various methods to include elements into a list. We have the option to append an element at the end of the list or insert an element at a specific index. Additionally, we can combine one list with another. When you need to merge multiple lists, you can utilize the + operator.

Citations:
Sources:
Bibliography:

Python List
Python.org Docs