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Lesson 6: Lists, Tuples, and Dictionaries | Coding Class Series

Introduction

Welcome to Lesson 6!
In this lesson, we will learn about Python data structures: lists, tuples, and dictionaries. These structures help you store and organize multiple values efficiently.

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1. Lists

A list is an ordered and mutable collection of items.
You can add, remove, or change elements in a list.

Syntax:

fruits = ["apple", "banana", "cherry"]
print(fruits[0])  # Access first item

Common List Methods:

fruits.append("orange")     # Add item
fruits.remove("banana")     # Remove item
fruits.sort()               # Sort items
print(fruits)

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2. Tuples

A tuple is ordered but immutable.
Once created, you cannot change its elements.

Syntax:

coordinates = (10, 20)
print(coordinates[0])

Why use tuples?

• They are faster than lists
• Useful for data that should not change, like coordinates or constants.

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3. Dictionaries

A dictionary stores key-value pairs.
You can access values using keys, not indexes.

Syntax:

student = {"name": "Alice", "age": 16, "grade": "A"}
print(student["name"])  # Output: Alice

Common Dictionary Methods:

student["age"] = 17        # Update value
student["city"] = "Delhi"  # Add new key-value pair
print(student.keys())      # Show all keys
print(student.values())    # Show all values

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Practice Exercises

1. Create a list of your 5 favorite movies. Print them in alphabetical order.
2. Create a tuple of your 3 favorite colors and try to change one color (observe what happens).
3. Create a dictionary for a book: title, author, year. Update the year and print all keys and values.
4. Use a list of dictionaries to store 3 students’ information and print each student’s name and grade.

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