Python Learning Session-07: Working with Lists

Python Learning Session-07: Working with Lists

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👋 Welcome Back!

If you’ve been following our Python journey, you already know how to work with strings. Today, we’re stepping into one of the most powerful tools in Python: Lists.

Think of a list like a shopping basket. You can throw in apples, bananas, and even a bottle of juice—all in one basket. Similarly, Python lists can hold multiple items, even of different types.

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✅ What is a List?

A list is a collection of items stored in a single variable. It’s like a container that keeps things organized.

Example:

Python

fruits = ["apple", "banana", "cherry"]

print(fruits)

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Output:

['apple', 'banana', 'cherry']

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✅ Why Do We Need Lists?

Imagine you’re building a student management system. Instead of creating 100 variables for 100 students, you can store all names in one list. Simple, right?

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✅ Creating Lists

Python

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

mixed = [1, "hello", 3.14, True]

empty_list = []

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✔ Pro Tip: Lists can hold anything—numbers, strings, even other lists!

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✅ Accessing Items

Lists use indexing:

Python

fruits = ["apple", "banana", "cherry"]

print(fruits[0]) # apple

print(fruits[-1]) # cherry

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✔ Why important? Indexing helps you grab exactly what you need.

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✅ Updating Lists

Lists are mutable, meaning you can change them:

Python

fruits[1] = "orange"

print(fruits) # ['apple', 'orange', 'cherry']

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✔ Real-life example: Updating a product name in your online store.

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✅ Adding Items

• append() → Add at the end

Python

fruits.append("grape")

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• insert() → Add at a specific position

Python

fruits.insert(1, "mango")

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✔ Why useful? Dynamic data handling without creating new lists.

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✅ Removing Items

• remove() → Remove by value

Python

fruits.remove("apple")

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• pop() → Remove by index

Python

fruits.pop(0)

 

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✔ Use case: Removing sold-out items from inventory.

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✅ Looping Through Lists

Python

for fruit in fruits:

print(fruit)

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✔ Practical example: Displaying all items in a shopping cart.

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✅ List Comprehension

A smart way to create lists:

Python

squares = [x**2 for x in range(5)]

print(squares) # [0, 1, 4, 9, 16]

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✔ Why powerful? Less code, more clarity.

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✅ Summary

Lists are your best friend when you need to store and manage multiple values. They’re flexible, easy to use, and form the backbone of Python programming.

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🔥 Challenge for You

Create a list of your favorite movies and print them one by one using a loop. Then, add a new movie to the list and remove one you don’t like anymore.