Change a list
with clear operations.

Lists can grow, shrink, and change as your program works with a group of values.

01 Learn02 Try03 Predict

01 Learn

List methods change a list in useful ways.

Use <code>append()</code> to add at the end and <code>insert()</code> to add at a chosen position.

tasks = ["Learn Python", "Practice loops"]
tasks.append("Build a project")
print(tasks)

append() adds one new item after the current final item.

['Learn Python', 'Practice loops', 'Build a project']

remove(value) removes a matching value. pop(index) removes an item at an index and returns it.

↳

Important difference: remove() looks for a value; pop() works with a position and gives the removed item back.

Remove and keep an item

items = ["book", "pen", "bag"]
items.remove("pen")
removed = items.pop(1)
print(items)
print(removed)

After removing "pen", the list shifts left, so index 1 then refers to "bag".

Check a list

numbers = [5, 10, 15]
print(len(numbers))
print(10 in numbers)

len() counts items and in checks whether a value is present.

02 Try

Python Playground

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Run each operation, then change an item or method and observe how the list changes.

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03 Predict

What will this program print?

Follow the list after append, then remove the item at index 1 with pop.

numbers = [5, 10, 15]

numbers.append(20)
numbers.pop(1)

print(numbers)

Your learning mentor

Ask Sloby about list operations

Describe what feels unclear about adding, removing, or changing list items.

Hi! I'm Sloby. Let's work through Python list operations.

04 Understanding Check

What will this program print, and why? Explain remove, pop, and the changed index.

items = ["book", "pen", "bag"]

items.append("laptop")
items.remove("pen")
removed = items.pop(1)

print(items)
print(removed)