Python Basics · Getting Started · Lesson 2 of 36
Comments and Readability
Concept
Comments and Readability
Lines starting with # are comments, ignored by Python but useful for explaining your code to humans.
Python has no separate multi-line comment syntax, though a triple-quoted string not assigned to anything is often used the same way.
By the end of this lesson
- Explain the core idea behind Comments and Readability.
- 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
# single-line commentExampleRunnable
# This program greets the user
print("Welcome!") # prints a greetingSelf-check before continuing
Without looking at the example, describe what changes when you modify one input in Comments and Readability. 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
Add a comment above one line of code explaining what it does.
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Console