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Previously, we wrote a script to which concatenated all these files, and we ended up with this merger

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that see us before, but we have these headers repeating in every X number of rows, so we want to do

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this again.

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But without the headers, without this and without that, just this one.

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So we import path, we create a path object for the directory, which contains the files we iterate

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over those files.

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We open each file, we read the content and then we add that contents to an empty string, so we keep

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adding to that string.

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But this time, we don't want to add the first line.

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In that case, we want to treat the content on a line by line basis.

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So currently, we have the content stored in this content variable as a string one single string that

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happens when you use the leads methods.

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But if you use the read lines, what we get is a list.

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Let's try that to you with open files, for example.

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File for that See as V in read mode as file.

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Content illegal to file that reads lines.

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Let's see what content is this time.

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So it's a list of strings.

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Each string represents one line.

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So is the first line and the break line as well.

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Backslash and the second line with a break line and so on.

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So now that we have this content list, we want to filter that out.

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So let's say new content is equal to content and we get all the items of the list.

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But the first one?

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So in other words, we get from the item with index one.

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This has an index of one.

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This is an index of two, three and so on.

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So we don't get the item with index zero, which is the first line.

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Of course, this will do this filtering for all of the files, but we need the header for the first

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file rights.

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So we want to do some sort of, if conditional here, rights somewhere in here.

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So we could say something like if index equal to zero.

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I'll tell you what index is in just a bit then, so if we're dealing with the first file, which will

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have an index of zero in the loop, then we want to do merged or yeah, we want to do this here.

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Merge a single to merge plus content.

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Ale's merge, a single to merge, plus new content.

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Plus that's backslash.

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Now, what is index index now could be for index five path in enumerate?

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That so that's a sane list, and I'll show you what this does.

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Let's suppose we have the list of file paths for the paths and which looks something like file for the

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C as V file five, the C as V and so on.

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Let's keep it with two only now when you do four index file path in enumerate file paths.

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Index will be the index of each of these.

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Items.

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So this is a way to extract the index, and therefore we see if index is equal to zero, then we don't.

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Remove the heads or so we use the contents as it is, otherwise we use the new contents, which does

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not have the header.

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Right.

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And then finally, we write the merged file in this file, so merge the CSB and we should be ready to

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run this.

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So run.

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Yes, we do get this error because it's trying to concatenate string with a list.

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So contents here is a list and merge these a string.

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So we want to convert that contents into a string because you saw that content was something like I-D

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and units and so on.

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We want to concatenate that's using the join method, which works like this.

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If you have, for example, a small string such as adults and you say, join this Join methods.

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If you give it a list as inputs and you have some lines such as B, C, some items D E F and you execute

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this, the join method will make a string out of those items and it will join them with these dots.

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So if you had other items, the dots goes between the items.

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Always.

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As you can see here, no evidence is an empty string.

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What you get is this.

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So nothing is applied between the items, but still you get one single string.

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So now let's convert.

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Where do we do the conversion before we do that, before we append content to merged?

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So just before the first conditional a string join content.

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So that is equal to content.

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You can override the existing variable, so right, the screen there currently, we have the least now

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where the string content is equal to that.

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The same we do for the else, Port New Contents, a sequel to that, but join.

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New content, then we have pens, new content to emerge, so run that.

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Go to merchants and sweet gets what we were asking for.

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So the heads are in the first line, then we have the first line with dots, our second thoughts and

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then comes the delta of the second file and then comes the delta of the third file.

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So that is the final code.

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Thank you for falling, and I'll talk to you later.

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Sue.