Python Lists Explained for Beginners (With Simple Examples)

Introduction

In the previous post, we learned about Python functions. Now it’s time to learn one of the most important data structures in Python — Lists.

Lists allow us to store multiple values in a single variable.

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What is a List?

A list is a collection of items stored in a single variable.

Lists can store different types of data and are written using square brackets [ ].

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Creating a List

numbers = [1, 2, 3, 4, 5]
names = ["Ayush", "Rahul", "Aman"]

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Accessing List Items

Each item in a list has an index starting from 0.

names = ["Ayush", "Rahul", "Aman"]
print(names[0])
print(names[1])

Index starts from 0, not 1.

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Negative Indexing

Negative indexing starts from the end of the list.

names = ["Ayush", "Rahul", "Aman"]
print(names[-1])

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Changing List Items

Lists are mutable, meaning their values can be changed.

numbers = [1, 2, 3]
numbers[1] = 10
print(numbers)

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Adding Items to a List

Using append()

numbers = [1, 2, 3]
numbers.append(4)
print(numbers)

Using insert()

numbers.insert(1, 99)
print(numbers)

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Removing Items from a List

numbers = [1, 2, 3, 4]
numbers.remove(3)
print(numbers)

numbers.pop()
print(numbers)

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Looping Through a List

We can use loops to access each item in a list.

names = ["Ayush", "Rahul", "Aman"]

for name in names:
    print(name)

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List Length

Use the len() function to find the number of items in a list.

numbers = [1, 2, 3, 4]
print(len(numbers))

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Common Beginner Mistakes

• Using wrong index number
• Forgetting square brackets
• Confusing append() and insert()

Always check the list index range.

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What You Learned in This Post

• What lists are
• How to create and access lists
• Add and remove items
• Loop through lists

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What’s Next?

Now that you understand lists, the next step is learning about tuples and sets.

Next Post: Python Tuples Explained for Beginners

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👋 About the Author

Ayush Gupta
MSc AI/ML Student | Machine Learning & Python Enthusiast

📧 Email: aygupta9898@gmail.com