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Hello, everybody, so we now start discussing dictionaries and this will be the advanced part in the

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previous videos that we got familiar with dictionaries, and now we'll learn some more cool manipulations.

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We can apply on it and we will learn how to create a nested dictionary, will learn how to remove cells

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out of the dictionary, how to make a duplicate and many more cool stuff.

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So first one is line is how can we create a nested a dictionary with nested entities and what is nested

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for that?

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Let me open the explorer and what we can see here.

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For example, we have the C drive.

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OK, so there is a small arrow here and once I click it, I can see what's inside the C drive so I can

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address C as a parent can tie it is the parent of follower of the city of BitBucket and so on.

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C is the parent and these are the child entities inside it.

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So this would, this would be called a child and this is a parent.

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And if we click on audacity, so we have additional nested folders inside it.

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So off halp folder audacity is the parent, while help is the child of audacity.

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So this is this what nested means nested means you have inside the parent while you have items inside

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it.

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OK, so in previous lectures, we studied how to create a key value dictionary, which was simple,

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we just initiated we just declared a dictionary and then inside we put key value, key value items.

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Now let's try to learn how to create a nested dictionary.

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The dictionary will contain two or more layers on it, on each key.

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In other words, you can see here a nested dictionary, and it contains the following we have here.

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This is.

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A parent cell, and this is also a parent cell, because these are the like muscle cells.

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All right.

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This is the outside layer of dictionary, same as we have here, key value.

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So in this occasion, we have key.

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Value.

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Kee.

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Value, these are this is a parent cell and this is also a parent cell.

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OK, so we see that this day and we are kids of parents cells.

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And while David and Lisa are keys of an inner layer, which is the child cells.

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So let's see, what do I mean here?

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All right.

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So, mijo.

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All right.

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Joe is a Web automation developer, and this dictionary is about Joe.

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So we can see here.

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And Joe, we declared the dictionary and here we have the following.

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We have the key age and we have the value.

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Thirty five.

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And then we have a comma separator between two parent cells.

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This is the first cell what marked in green and this is the second cell.

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So we have here a key age thirty five.

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And here we have also a key, which is kids.

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And the value is what comes after the kids.

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All of this David boy, Lisa girl, all that part is one one big value that is attached to the kids

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key.

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OK, and once looking inside the kids value, you can see there additional nested cells.

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So inside that you can see David, which is a key and the value is a boy.

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And because the key of the both child cells, the key of them are kids.

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So here we are going to have some information about kids, obviously.

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So we have David, which is a boy, and this is child's cell one.

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It is nested.

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And we also have Lisa, which is a girl, and this is child cell two, which is also nested.

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They are both nested inside kids.

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So this is quite simple.

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If you get the hang of the rules here and it's pretty much the same, only you will drill down inside

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the cells.

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All right.

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So this is a good example to understand from for for the practice and follow following topics.

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OK, so it's pretty much the same.

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There's nothing new here.

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Just the difference is that until now we knew that we have QI, which is one certain string or a number,

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and we have a value, which is also a string number or boolean.

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And here in the kids, our value is not only one type of input, it has nested for inputs.

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So the value now has nested cells.

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OK, so coming to the next topic, which is related to the what we just learn how to extract a value

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bickie out of a nested dictionary.

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So we have learned in previous lectures that if you want to extract a value, for example, we have

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this dictionary once.

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We want to extract the H the H sale value.

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So I'll just mention the dictionary, then square brackets and put the key inside.

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And then once we apply it and print it out, the output is obviously going to be thirty two.

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OK, this one we have already learned.

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And now let's see how can we do it with nested.

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OK, so here we have an example for nested dictionary.

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All right.

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And let's see how it works with Nesto Dictionary, and once we need to extract the value out of a nested

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dictionary, we do it in the same way.

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Yeah, so we do it in the same way and the way to do it, if you want to extract a dictionary next,

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it says we should use their key, which is kids.

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Yeah.

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So if we have a dictionary here.

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And as we did here before, we wanted to extract the value of age, meaning 32, we just mentioned the

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dictionary have put the key inside square brackets.

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So here we are going to do just the same thing.

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We're just going to do Joey and then kids.

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And once we apply that, we can extract the values which are inside the value cell and we can't even

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go further and.

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Doing advanced example.

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Which will be the following.

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So what if.

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We want to just want to lose the mark yellow marker, so if we would like to extract.

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The value.

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Like the gender.

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Of David, how can we do it?

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OK, so the way to do it is, first of all, to extract the kids and then from inside the kids, we

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need to extract David, which is also the key.

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Correct.

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So once we apply this, it's like double extraction, we will get the output of.

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Boy, OK, so this is the way to do it if you want to extract the right part here right part, which

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is the value you just mentioned the kids key, if you want to extract the value of the inner cell,

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you mentioned this key.

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Once you mentioned this key, this is for your disposal and then you want to extract the boy.

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So you mentioned David, which is this key and then you will extract the boy value.

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OK, all right.

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So now let's see, how can we create a dictionary, which is a copy of an existing dictionary?

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Sometimes we want to make duplicate of our existing dictionary and we can achieve it by using the copy

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action.

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All right.

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So in a few seconds, we'll see how to do it.

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It's pretty simple.

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OK, you just declare a new dictionary, then you do equals and then you mention the old dictionary

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and use the DOT copy action.

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So now once we try to print.

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Joe, a new dictionary, we will see a printout of exactly what we have in the original dictionary.

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So this is how you duplicate the dictionary.

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And now, last but not least, basically it's not last.

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All right.

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So we have we we want now to delete a complete cell.

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We already encountered the pop action key in this.

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So we know how to delete cells in this.

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But let's see if it's the same in dictionaries.

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So we use pop action, same words do the lists.

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This will delete both key and value of the cell.

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This means that if we do the following thing, we address this dictionary and we use pop and put inside.

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OK, we put inside the key item inside the box.

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So once we apply this meaning, we want to remove this cell.

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Once we print Alex afterwards, after using Pop, we'll just lose the age and the 32 values which are

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key and value connected AM, and this way we will just delete them out of the dictionary.

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And now let's see, how can we add a new cell, for example?

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We would like to add a new cell to the dictionary.

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We have again, we have this one.

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We have Alex Dictionary.

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And the way that we can add additional cell here at the end is the following.

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We just mentioned the dictionary right after in square brackets, we put the Newquay that we want to

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insert and then we do equals and mention the value.

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All right.

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So in our in our case, we'll just do this, Alex, then square brackets and then I have I want to add

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an apartment number five to the list, to the dictionary.

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So I apply here the key apartment number.

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And here I supply the value.

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And then after we print the dictionary, we will have this part, which is the old part which was existing

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before.

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And we will also additionally have the new part, which is the key that we answered and the value easy.

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Right.

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There's nothing too complicated here.

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Once you get the things, once you get down to the core of it, nothing is too complicated.

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And finally, last but not least, how can we remove all elements out of the dictionary?

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Meaning we want to remove everything to do a clear cache, to do a scratch everything out of the dictionary.

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So this one is very simple.

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We just use the clear action key and then once we use the clear, we try to print the dictionary and

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we get nothing.

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We just get clean, curly brackets and that's it.

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There's nothing there.

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All right.

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So this was the advanced part of dictionary.

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I hoped you liked it.

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We learned a lot of things here, and obviously this is the main part of it.

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And try to reverse this lecture.

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If you didn't get all the parts, it's sometimes good to hear the same mixture several times.

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And this is about it for that part.

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All right.

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So in the following video, you will get practice regarding this material and afterwards also a resolution

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for it.

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OK, then that's about it.

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Bye bye.

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See you in the next lecture.