Python: Comments

Almost all programming languages allow you to leave comments in your code. The interpreter ignores them — they exist only for people, to explain how the code works, mark places that need fixing, or remind yourself what to add later:

# Delete the line below after the registration task is done
print(10)

Comments in Python start with the # sign and can appear anywhere in the program. Everything after # is ignored by the interpreter:

# comment      ──→  [ skipped by interpreter ]
  print('hello') ──→  [ executed → hello ]
  # another one  ──→  [ skipped by interpreter ]

A comment can take up an entire line. When one line isn't enough, use several:

# The night is dark and
# full of terrors.
print('I am the King')

Or place it at the end of a line with code:

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

Comments don't affect how the program runs, but they make code easier to understand — both for your future self and for teammates reading your code.

A good rule of thumb: write code that's clear without comments, but when something needs explaining — comment it.

Special comments: BEGIN and END

As you work through lessons, you'll sometimes see code that looks like this in the editor:

# BEGIN

# END

BEGIN and END are ordinary comments that don't affect how the program runs. They mark the place where you should write your solution — between them:

# BEGIN
<your solution here>
# END

The code outside the markers is part of the exercise setup and should be left untouched. In short: if you see BEGIN and END, write your code between them.

Instructions

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 🤨

My code is different from the teacher's one 🤔

I've read the lessons but nothing is clear 🙄

Found a bug? Have something to add? Pull requests are welcome!

Python: Comments

# Delete the line below after the registration task is done
print(10)

Comments in Python start with the # sign and can appear anywhere in the program. Everything after # is ignored by the interpreter:

# comment      ──→  [ skipped by interpreter ]
  print('hello') ──→  [ executed → hello ]
  # another one  ──→  [ skipped by interpreter ]

A comment can take up an entire line. When one line isn't enough, use several:

# The night is dark and
# full of terrors.
print('I am the King')

Or place it at the end of a line with code:

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

Comments don't affect how the program runs, but they make code easier to understand — both for your future self and for teammates reading your code.

A good rule of thumb: write code that's clear without comments, but when something needs explaining — comment it.

Special comments: BEGIN and END

As you work through lessons, you'll sometimes see code that looks like this in the editor:

# BEGIN

# END

BEGIN and END are ordinary comments that don't affect how the program runs. They mark the place where you should write your solution — between them:

# BEGIN
<your solution here>
# END

The code outside the markers is part of the exercise setup and should be left untouched. In short: if you see BEGIN and END, write your code between them.

Instructions

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

languages.lessons.show.profession_description

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 🤨

My code is different from the teacher's one 🤔

I've read the lessons but nothing is clear 🙄

Found a bug? Have something to add? Pull requests are welcome!

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Your exercise will be checked with these tests:

def test():
    with open("solution.py") as file:
        comment = file.read().rstrip()
        assert comment == "# TODO: добавить функцию приветствия"
        print(comment)

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Teacher's solution will be available in:

20:00

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