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Welcome to the fourth and final challenge of section 19.

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I'm in the section 19 workspace in the challenge_4 project.

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We also have a challenge_4_solution project

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which contains a solution.

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This challenge is pretty easy, but it's kind of fun.

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The idea is that we have the Romeo and Juliet play that we've used before.

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And what we want to do is we want to read that in,

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add line numbers to it and then write it out to a new file.

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So we're not going to modify the original file. We're going to create a copy of the

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original file that has line numbers on it.

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Okay. So it's real nice, really easy to do, and we'll get you a little bit

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of experience writing more files.

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Let me run this for you.

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I'm going to run the solution, and it shows no output, it just says copy complete

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because there's not much to show. But let's open up the

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enclosing folder here so we can see what's created.

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Now here you can see the original Romeo and Juliet.

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There's no line numbers here on the left.

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And this is the file that's created right here, RomeoandJuliet_out. You can name that anything you like.

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And you can see that that has line numbers now nice and formatted.

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And you can see them all lined up right around the side.

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There are a lot of line numbers in this file,

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about 5000 something. I believe

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now there's one thing I don't like about this solution

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is -- let me scroll there, you see this solution

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gives line numbers to all these empty lines.

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I guess that's okay.It all depends on what you want a line number. So

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I'm doing it two ways. I'm doing it like this.

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And then I'll show you another way in a second, which

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gives only line numbers to lines that actually have text.

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Okay. So let me run that solution in a second I'll show that one to you.

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Okay. So I'm going to run this other version.

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And its copy is complete, and then we'll take a look at what it looks like.

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And right here, RomeoandJuliet_out.

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And you can see it looks exactly like the previous one except that blank lines aren't numbered.

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So you can see that we're skipping those blank lines, we're still displaying

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them like they were in the original file, but we're not numbering them.

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And I think it looks a little easier to read this way. I mean I don't know whether

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line numbers are put into scripts like this or not,but

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different option. It gives you two different solutions, and you can experiment with that.

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I'll show you both solutions when we do the solution project in a little bit.

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So that's it. Have fun.

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Okay. So that's it for this video. I'll see you in the solution.