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Hello, everybody, this will be the second part of lists topic now once we completed the basics part,

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we will head over to the advance spot regarding lists.

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And before we begin, I just want to give you a motivation why actually, we need to be masters and

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less in this topic.

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And we have a really simple reason for that, guys.

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Sometimes further on, once we try once we start practicing selenium and start building our automation

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end to end solution project, we will encounter elements that have elements meaning items in a website.

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All right.

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So sometimes we encounter some elements on a website which the identifiers, the ides of several elements

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are the same.

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And we would like to insert, for example, the text there containing in a list.

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So first we will identify them and then we will insert all of the values at once into a list.

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So we need to know how to manipulate a list.

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I'll give you a quick example.

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For example, you see here I have a table, all right?

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I have a table.

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I'm not going to go to specifics.

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I tell you in advance, because we have a lot of hours discussing how to identify elements further on.

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But just want to show you that I identified all the items inside this table right here.

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And for example, in future lectures, I would like to extract the text all of these cells into a list,

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into separate cells.

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So starting you see, it's it's marked here.

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So starting the first item, then the second and the third and so on.

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So for this, I will definitely know.

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I definitely need to know how to master list topic to use it.

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So this was the motivation part of why do we need lists at all.

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So we will use it a lot, believe me.

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All right.

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So let's begin.

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First of all, we declared a list that we will use in this theory, part of advanced list topic.

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All right.

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So this is this will be our list and let's begin.

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So, first of all, I would like to know the length of the list, the number of existing cells.

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The countdown starts here from one.

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OK, so we have like two topics, so you won't be mixed out with them.

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We have the length.

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All right.

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Count.

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Starts from one and we have the index indexes count.

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Start from zero.

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And what do I mean?

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All right, so we want to know the length of the list.

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So we just put the key word length, then brackets and put the name of the list inside.

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And then once we try to print it, we will get the number four.

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And why?

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Because once we try to count the number of the cells, you're right.

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This is the lank.

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All right.

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So the count starts from one.

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So this will be one.

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This will be two.

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This will be three.

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And this will be four.

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So once we try to print it, we'll get the number four.

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All right.

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And in a difference from the lank, when we want to access the cells, the count starts from zero.

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All right.

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You you you I'm sure you remember from previous lecture, from previous practice lecture.

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Once we want to access this cell, for example, it doesn't start from one star from zero.

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So these cells index is zero.

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So these two are not connected when counting the length of the of the list will start the count from

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one.

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But once we want to to address the index is once we want to go into the cells and extract the items,

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we will start the count from zero.

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All right, so let's go further to the next item.

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All right, if you want to change the value of a specific cell inside the list, so let's say we want

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to change the value in the cell in cell number one.

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All right.

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So cell number one is this one.

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And all right, it's right here.

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So and we want to set the value 10 inside of the cell that currently contains the one hundred and eleven

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point nine.

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We will just use the following action.

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We will state the name of the list.

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Then we have square brackets with the number of the cell inside.

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OK, and then we have equals and the new value that we want to put there.

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So this will replace this value with the value ten.

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Pretty easy, right?

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All right, so let's go over to the next one once we want to add an item.

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To the end of an existing list, so if you recall in the last practice lecture, I gave you a bonus

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assignment, which was assignment number eight search in Google, and I promise you that this topic

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will be studied in the next video.

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So here it is.

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And what we want to do here, as is just to add an additional value to the end of the list.

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And we saw in the previous practice video that we can use we can achieve it by the apparent action and

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we do it in the following way.

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We just state we just mentioned the name of the list and then we add that and add the append key action

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action word.

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And inside the brackets, we're adding the new value that we want to add.

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So once we apply this action.

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And what what will happen is just we would add a 15 value, a value 15 to the last sell, like an additional

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sale will be added and it will contain the value of 15.

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All right.

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Done.

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OK, so next in line is what happens if we want to add an item to a specific cell in the list.

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All right.

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So we want to add an item to an existing cell.

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We just want to add an item to that cell.

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So let's say we want to add the number one thousand and five to cell number two.

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So we would have to use this action.

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Just declaring the list, then using that, then using the keyword insert, then inside the brackets

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will put the value that we want to add and then a comma and then then the number of the cell we would

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like to add the value to this will cause the existing item of the cell to move forward to the next cell.

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So what will happen is the following.

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So we were having this list.

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And we want to add the number one thousand and five to cell number two, so this is zero, index one

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and two.

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So what will happen is the following will be added to here.

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And the item that was in cell number two would move over to the next cell like this.

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So this will be, uh, what will we get after adding to the value one thousand five.

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All right.

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Breathe easy with the easy guys.

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It's not very hard, just some key actions to manipulate.

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All right.

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So next one is how to remove an item by mentioning the value of it.

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All right.

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We want to remove a certain value out of the list.

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So we just use the remove action key again.

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First of all, just by mentioning the name of the list and then DOT and then the keywords remove and

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then we state, then the the value that we would like to remove once we apply the S..

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The value 1005 would be removed from the list here before moving to the next one.

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Just want to mention that here we stated the value that we would like to remove.

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And in the next next item here, we would like to remove an item by mentioning the sale index.

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All right.

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Here was the value and he would like to use the Salleh index.

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So to remove an item by mentioning the sale index, we would like to use the pop action key.

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All right.

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And we can use the pop by two ways.

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First one is mentioning the name of the list, then that and then pop and brackets.

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This one would remove the last item.

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All right.

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This would remove the last item of the list.

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This is the opposite of a band, right?

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It's its sibling.

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Because band will add a value to the end of the list.

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It will create a new cell and add a value to it.

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But on the other hand, if you use pop, it will remove the last item of the list.

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All right.

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So this is one way to use it.

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And also we have another way to use it.

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Also, name of the list that Bob.

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All right, and inside the brackets, we can mention the cell that we would like to remove show here,

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for example, I would like to remove cell index zero, meaning going up to the list.

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I would like to remove the cell completely.

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So once remove it, these are the cells that will be remaining at the list.

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All right.

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So pretty easy.

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And this completes the theory part advanced.

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Part of this is not very hard.

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It's just using some action keys upon a list.

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And we will see much examples in the following lectures.

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I will show you coding examples of list manipulation.

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And afterwards we will head over to the practice part, which you can practice the list at that spot

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as well.

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And that's about it, guys.

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So see you in the next video.