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Python: Comments

Almost all programming languages allow you to leave comments in your code. The interpreter ignores them. They're only for people; they let the programmer leave notes for themselves and other programmers.

They allow you to add explanations of how the code works, what errors need to be corrected, or what you need to remember to add later:

# Delete the line below after the registration task is done

Comments in Python begin with the # sign and can appear anywhere in the program. They can take up an entire line. If one line is not enough, you can create several comments:

# For Winterfell!
# For Lanisters!

The comment can be on the line after the code:

print('I am the King') # For Lannisters!


Create a one-line comment with the text: You know nothing, Jon Snow!

The exercise doesn't pass checking. What to do? 😶

If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:

  • Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨

Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.

My code is different from the teacher's one 🤔

It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.

In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.

I've read the lessons but nothing is clear 🙄

It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.

By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.


  • Comments text in the program code that does not affect the functionality and is added by programmers for themselves and their colleagues.

If you got stuck and don't know what to do, you can ask a question in our community