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Hey, welcome to the experiments for today.

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Earlier today, we needed to remove the brake lines from each to do item, and for that we tried to

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different ways with first tried the list comprehension.

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Which looked something like this.

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So we reassigned the new client list to a.

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New variable.

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But then we found out that since we have this for loop, then we could simply apply the strip method

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here instead of iterating over the list in a list comprehension.

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So then what I did is I removed this line from the code.

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Ah.

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But a better way would be to just comment this line.

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The way you comment a line is by using.

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The hash.

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Symbol.

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So you just add that symbol in front of the line, you want to comment.

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So what is commenting anyway?

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Well, commenting means this line will not be executed by the interpreter now.

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So it is in the code.

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It's just for us programmers to see it, but the interpreter will not use it.

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Now we get this on the line here because it is recommended to have a space between the symbol and the

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command line.

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It is not a requirement.

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It is a recommendation.

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So another illustration, if we had this print function here on top, how high and we run the codes,

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of course we would see how high.

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But if I add the hash symbol in front of print and and I run the code now, I will not print it out.

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So comments are useful to have when you have some codes that maybe you want to execute in the future,

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maybe you're not sure if you really want to delete it, so just keep it for reference there.

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So the comment feature would be useful for that.

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So that's one use of the comments to just comment code out so it is not executed.

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The other usefulness is to describe your code.

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For example.

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Let's say that when you come later on in your code and you don't remember what you're doing in these

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two lines.

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So it's a good idea to actually when you're programming, it's a good idea to actually write a comment

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here that describes these two lines.

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For example, get user input and remove or and strip.

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Space characters.

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From it.

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So by looking at this, it gives you some information about what these two lines are doing.

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Similarly, you could add a comment above this line.

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So you press enter here to create a break line, the hash symbol, and then you say.

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Check if user action is.

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And.

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So that comment tells you that this case ad is checking for the user action.

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However, you shouldn't abuse comments.

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So I do think that in this case, this comment is unnecessary because as a programmer, you know, that

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case ad checks the string against that variable.

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So it doesn't really give any much extra information to just say what case ad does.

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So you only need you only want to use comments when you really think it's necessary that I code the

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line should have more extra information to tell to the programmer.

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And that is also why variable naming is important.

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So you should use meaningful names for variables so that you don't have to use comments.

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For example, by saying here to dos, you know, that this is a list of to two items.

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But if you just said Delta, then it would be a bit ambiguous what this would actually mean.

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So be specific and descriptive with variable names.

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So use comments whenever you think some code does really need some description and that's what you normally

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do.

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So write the line above a block of code.

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For example, here would be another example.

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Right to do.

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In the file.

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But again, this wouldn't be necessary because we know what the open function does.

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But if you wanted to comment that blog, you just write the comments on top of it.

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So that's about code experiments for today.

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We were focused on comments and let's keep going.