Python Comments

Comments in Python — how to write notes python ignores. Understanding how comments works is essential for writing clean, idiomatic Python and is a stepping-stone to more advanced topics in the standard library and ecosystem.

Python implements comments with deliberate simplicity — the syntax is minimal and the runtime behaviour is predictable. Read the example below from top to bottom; Python executes each statement in that order, and the data flows line by line.

python Run in compiler
# This is a single-line comment
'''
Multi-line
comment
'''
print('done')

# Run the example in the Codekilla compiler to see the output

This is the canonical minimal example for comments. Each line maps to one concept — change a value, re-run, and watch which output shifts. That experimentation loop is how all professional Python is learned.

• Comments keeps Python code expressive and short.
• Python's syntax was designed for readability — read code top-to-bottom like a recipe.
• Built-in comments operations are written in optimised C inside CPython.
• Combine this with previous lessons to build something useful.

1. Re-type the Code Example from memory; run it.
2. Modify one value and predict the new output before pressing Run.
3. Combine this lesson with the previous one — write a 5-line snippet that uses both.

• Read the official Python docs for this topic at https://docs.python.org/3/ — it's the authoritative reference.
• When stuck, drop a print(...) line right above the puzzling code — Python's debugger of last resort.
• Use the Codekilla compiler to experiment without leaving the lesson page.