> For the complete documentation index, see [llms.txt](https://clicktostart.gitbook.io/introduction-to-python/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://clicktostart.gitbook.io/introduction-to-python/python-basics/comments.md).

# Comments

Not every bit of code you write has to do something. Python, as with many other programming languages, allow us to write comments - code written for developers that are not executed by the compiler or interpreter. In Python, comments begin with `#`.

```python
# Comments are ignored by the interpreter
print('42') # You can have in-line comments as well, everything after # is ignored
```

Comments are useful for explaining code to a programmer. In this course you'll see many comments to guide you on how to follow a lesson or to give instructions for an exercise. That's now how comments are usually used in software developement. A good comment should explain **why** the code is doing what it's doing, now how. Good code should explain how it works, no comment can replace that.