All language subtitles for 003 Comments_en

Welcome back.

In this video, we'll go over comments in Python.

I am creating a new script.

Guido van Rossum, the creator of Python, once said that code is more often read than written.

When working with any programming language, you should include comments in the code to notate your

work.

This documents what certain parts of the code are for and lets other developers, you included, know

what you intended to do when you first wrote the code.

This is a very good practice in any programming language, and good developers make heavy use of comments.

Without them, things can get really confusing, especially in complex projects.

Comics in Python.

Start with the hash character and extend to the end of the line.

A comment may appear at the start of a line or following the code.

Comments are for clarifying code and are not interpreted by Python.

Let's see some examples.

This is a comment.

It's recommended to add a whitespace after the hash symbol for readability.

Hash A equals five.

This line is another comment.

X equals nine.

And I'm adding an inline comment here.

I create a variable called x.

That store's an integer.

A hash character within a string.

Literal is just the character, not a comment.

For example, my star equals a hash and I'm adding a hash character within a string.

Literal.

This is a string.

Literal is just a hash character.

It's not a comment.

In other programming languages, there are ways to comment out an entire block of code here in Python.

If you want to comment out multiple lines, you need to prefix each line.

You want to comment out with a hash sign.

I'm adding a few more lines of code.

In picture.

After selecting the code, you want to comment out press control and for backslash.

And it will comment out the entire block of code by commenting out each individual line of that block

of code.

And if you select that block of code again and press control and for backslash, it will uncomment it.

I am pressing control.

And for Slash.

Sometimes you might see something like this.

Triple quotes and some python code in between.

X equals ten.

Print x.

I'm running the script.

It didn't print the value of X.

Even though that's not interpreted by Python and is basically like a comment, it's not actually one,

but rather a docstring and recommendation is to not use this syntax for comments.

Doc strings are used for documentation and we'll talk about them later in the course.

The excel about comments in Python.

In the next video we'll talk about constants.

Thank you.