Mastering Python: The Ultimate Guide to Python's Built-in Data Structures
Josh Wenner
I Breakdown Complex Tech Jargon ~ Python Dev | Teacher | Author of The Nerd Nook
Python's Essential Data Structures: Exploring Lists, Tuples, Dictionaries, and Sets with Code Examples
In the building of your Python foundations, we move forward to the fourth step of my 7-series guide for beginners. These are the same steps I go through with my students. This week, we're stepping into another crucial aspect of Python: built-in data structures. Python provides developers with an array of data structures to manage and manipulate information efficiently. We'll be focusing on lists, tuples, dictionaries, and sets, uncovering their unique characteristics and use cases. So, if you're ready to elevate your Python programming to the next level, let's get started!
Your Go-To Sequence Container
Lists are perhaps the most versatile and commonly used data structures in Python. They allow you to store a collection of items in a specific order, and the items can be of any data type—integers, strings, even other lists! Every item in a list is called an element. To create a list, simply enclose the items within square brackets and separate them with commas. You may also use the Python list() constructor function.
# Creating a list of numbers
numbers = [1, 2, 3, 4, 5]
# Creating a list of strings
fruits = ["apple", "banana", "orange"]
Key Characteristics of Lists
Accessing List Elements
List elements are accessed using indexing. The word index literally means position. What is the position of an element in the list? What is the index of an element in the list? It’s the same meaning. Python uses a 0-based index, where the first element is at index 0, the second at index 1, and so on.
print(fruits[0]) # Outputs: "apple"
print(numbers[2]) # Outputs: 3
List Methods and Operations
Python provides a variety of methods to manipulate lists. We are only going to talk about a few of these here today, as the goal of this series is not to overwhelm you but inform you. Introduce you to these concepts at a basic level. You can still solve most tasks with these basics. Let’s take a look at a few key methods (functions) we use while working with lists.
Appending and Extending
The append() method adds an element to the end of the list. In English, the word append literally means add. We use append() to add a single value to the list. The extend() method would allow us to add multiple elements from another list.
fruits.append("grape") # Adds "grape" to the end of the list
numbers.extend([6, 7, 8]) # Adds multiple numbers to the list
A literal translation of both of the above examples could be, I want you to add, this/these item/s to my list named fruits/numbers.
Inserting Elements
The insert() method adds an element at a specific index. This allows you to add an element to a certain position in your list without deleting an existing value at that current index...
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