Python Basics · Data Structures · Lesson 15 of 36
Lists
Concept
Lists
Lists are ordered, changeable collections, created with square brackets.
Lists can hold mixed types and can be sliced with fruits[1:3] to grab a range of items, similar to slicing a string.
By the end of this lesson
- Explain the core idea behind Lists.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Syntax
my_list = [item1, item2, item3]
my_list.append(item)ExampleRunnable
fruits = ["apple", "banana", "mango"]
fruits.append("kiwi")
print(fruits[0], len(fruits))Slicing a list
fruits = ["apple", "banana", "mango", "kiwi"]
print(fruits[1:3])Note: Slicing [start:stop] includes start but excludes stop, same rule as range().
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Lists. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Create a list of 5 courses and print the third one.
Loading editor…
Console