List Operations

Add, remove, sort, and slice

Level up your lists! Learn to add items, remove items, sort them, and slice out pieces.

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What we are learning

Lists are not static — you can change them! Add items with append(), remove items with remove(), sort them with sort(), and extract pieces with slicing. These operations make lists incredibly powerful.

💡 Think of it like this:

Think of a list like a notebook. You can add new pages (append), tear out pages you do not want (remove), rearrange the pages (sort), and copy a section of pages (slice).

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Why it matters

Real programs constantly modify lists. A game adds items to your inventory, removes used ones, and sorts them by type. A to-do app adds tasks, removes completed ones, and sorts by priority.

Where you see this in real life:

✓To-do apps add, remove, and reorder tasks
✓Email apps sort messages by date, sender, or subject
✓Shopping carts add and remove items as you shop

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By the end, you can:

1.Add items with append() and insert()
2.Remove items with remove() and pop()
3.Sort lists with sort() and reverse()
4.Slice lists with [start:stop]

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New words

appendinsertremovepopsortslice

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If you had a list of your friends and someone new joined your class, how would you add them? What if someone left?

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Fun Fact!

Python lists can hold any type of data — even other lists! You can have a list of lists, like a grid or a spreadsheet.

🔧 List Operations

Lists are not fixed — you can change them! Add items, remove items, sort them, and slice out pieces. These operations make lists incredibly powerful.

➕ Adding Items

Use append()to add an item to the end of a list.

🐍Add items with append() and insert()

main.py

● Output

Click ▶ Run to see the output!

➖ Removing Items

Use remove()to remove a specific item, or pop()to remove by index.

🐍Remove items with remove() and pop()

main.py

● Output

Click ▶ Run to see the output!

🔀 Sorting Lists

Use sort()to put items in order, and reverse()to flip the order.

🐍Sort and reverse lists

main.py

● Output

Click ▶ Run to see the output!

✂️ Slicing Lists

You can cut out a piece of a list using slicing:list[start:stop]

🐍Slice lists with [start:stop]

main.py

● Output

Click ▶ Run to see the output!

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Try this: create a list of 6 numbers. Sort them, then print the top 3 (the last 3 after sorting)!

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Quick Quiz!

+10 XP

What does the append() method do?

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Finished the lesson? Click the button to mark it complete and earn XP!